MPEG Audio Layer III,^[4] more commonly referred to as MP3, is a patented encoding format for digital audio which uses a form of lossy data compression. It is a common audio format for consumer audio storage, as well as a de facto standard of digital audio compression for the transfer and playback of music on digital audio players.

MP3 is an audio-specific format that was designed by the Moving Picture Experts Group (MPEG) as part of its MPEG-1 standard and later extended in MPEG-2 standard. The first MPEG subgroup – Audio group was formed by several teams of engineers at Fraunhofer IIS, University of Hannover, AT&T-Bell Labs, Thomson-Brandt, CCETT, and others.^[7] MPEG-1 Audio (MPEG-1 Part 3), which included MPEG-1 Audio Layer I, II and III was approved as a committee draft of ISO/IEC standard in 1991,^[8][9] finalised in 1992^[10] and published in 1993 (ISO/IEC 11172-3:1993^[5]). Backwards compatible MPEG-2 Audio (MPEG-2 Part 3) with additional bit rates and sample rates was published in 1995 (ISO/IEC 13818-3:1995).^[6][11]

The use in MP3 of a lossy compression algorithm is designed to greatly reduce the amount of data required to represent the audio recording and still sound like a faithful reproduction of the original uncompressed audio for most listeners. An MP3 file that is created using the setting of 128 kbit/s will result in a file that is about 1/11 the size^{[note 1]} of the CD file created from the original audio source. An MP3 file can also be constructed at higher or lower bit rates, with higher or lower resulting quality.

The compression works by reducing accuracy of certain parts of sound that are considered to be beyond the auditory resolution ability of most people. This method is commonly referred to as perceptual coding.^[13] It uses psychoacoustic models to discard or reduce precision of components less audible to human hearing, and then records the remaining information in an efficient manner.

History[link]

Development[link]

The MP3 lossy audio data compression algorithm takes advantage of a perceptual limitation of human hearing called auditory masking. In 1894, Alfred Marshall Mayer reported that a tone could be rendered inaudible by another tone of lower frequency.^[14] In 1959, Richard Ehmer described a complete set of auditory curves regarding this phenomenon.^[15] Ernst Terhardt et al. created an algorithm describing auditory masking with high accuracy.^[16] This work added to a variety of reports from authors dating back to Fletcher, and to the work that initially determined critical ratios and critical bandwidths.

The psychoacoustic masking codec was first proposed in 1979, apparently independently, by Manfred R. Schroeder, et al.^[17] from AT&T-Bell Labs in Murray Hill, NJ, and M. A. Krasner^[18] both in the United States. Krasner was the first to publish and to produce hardware for speech (not usable as music bit compression), but the publication of his results as a relatively obscure Lincoln Laboratory Technical Report did not immediately influence the mainstream of psychoacoustic codec development. Manfred Schroeder was already a well-known and revered figure in the worldwide community of acoustical and electrical engineers, but his paper was not much noticed, since it described negative results due to the particular nature of speech and the linear predictive coding (LPC) gain present in speech. Both Krasner and Schroeder built upon the work performed by Eberhard F. Zwicker in the areas of tuning and masking of critical bands,^[19][20] that in turn built on the fundamental research in the area from Bell Labs of Harvey Fletcher and his collaborators.^[21] A wide variety of (mostly perceptual) audio compression algorithms were reported in IEEE's refereed Journal on Selected Areas in Communications.^[22] That journal reported in February 1988 on a wide range of established, working audio bit compression technologies, some of them using auditory masking as part of their fundamental design, and several showing real-time hardware implementations.

The immediate predecessors of MP3 were "Optimum Coding in the Frequency Domain" (OCF),^[23] and Perceptual Transform Coding (PXFM).^[24] These two codecs, along with block-switching contributions from Thomson-Brandt, were merged into a codec called ASPEC, which was submitted to MPEG, and which won the quality competition, but that was mistakenly rejected as too complex to implement. The first practical implementation of an audio perceptual coder (OCF) in hardware (Krasner's hardware was too cumbersome and slow for practical use), was an implementation of a psychoacoustic transform coder based on Motorola 56000 DSP chips.

As a doctoral student at Germany's University of Erlangen-Nuremberg, Karlheinz Brandenburg began working on digital music compression in the early 1980s, focusing on how people perceive music. He completed his doctoral work in 1989.^[25] MP3 is directly descended from OCF and PXFM, representing the outcome of the collaboration of Brandenburg - working as a postdoc at AT&T-Bell Labs with James D. (JJ) Johnston of AT&T-Bell Labs - with the Fraunhofer Institut for Integrated Circuits, Erlangen, with relatively minor contributions from the MP2 branch of psychoacoustic sub-band coders. In 1990, Brandenburg became an assistant professor at Erlangen-Nuremberg. While there, he continued to work on music compression with scientists at the Fraunhofer Society (in 1993 he joined the staff of the Fraunhofer Institute).^[25]

The song Tom's Diner by Suzanne Vega was the first song used by Karlheinz Brandenburg to develop the MP3. Brandenburg adopted the song for testing purposes, listening to it again and again each time refining the scheme, making sure it did not adversely affect the subtlety of Vega's voice.

Standardization[link]

In 1991, there were only two proposals available that could be completely assessed for an MPEG audio standard: Musicam (Masking pattern adapted Universal Subband Integrated Coding And Multiplexing) and ASPEC (Adaptive Spectral Perceptual Entropy Coding). The Musicam technique, as proposed by Philips (the Netherlands), CCETT (France) and Institut für Rundfunktechnik (Germany) was chosen due to its simplicity and error robustness, as well as its low computational power associated with the encoding of high quality compressed audio.^[26] The Musicam format, based on sub-band coding, was the basis of the MPEG Audio compression format (sampling rates, structure of frames, headers, number of samples per frame).

Much of its technology and ideas were incorporated into the definition of ISO MPEG Audio Layer I and Layer II and the filter bank alone into Layer III (MP3) format as part of the computationally inefficient hybrid filter bank. Under the chairmanship of Professor Musmann (University of Hannover) the editing of the standard was made under the responsibilities of Leon van de Kerkhof (Layer I) and Gerhard Stoll (Layer II).

ASPEC was the joint proposal of AT&T Bell Laboratories, Thomson Consumer Electronics, Fraunhofer Society and CNET.^[27] It provided the highest coding efficiency.

A working group consisting of Leon van de Kerkhof (The Netherlands), Gerhard Stoll (Germany), Leonardo Chiariglione (Italy), Yves-François Dehery (France), Karlheinz Brandenburg (Germany) and James D. Johnston (USA) took ideas from ASPEC, integrated the filter bank from Layer 2, added some of their own ideas and created MP3, which was designed to achieve the same quality at 128 kbit/s as MP2 at 192 kbit/s.

All algorithms for MPEG-1 Audio Layer I, II and III were approved in 1991^[8][9] and finalized in 1992^[10] as part of MPEG-1, the first standard suite by MPEG, which resulted in the international standard ISO/IEC 11172-3 (a.k.a. MPEG-1 Audio or MPEG-1 Part 3), published in 1993.^[5] Further work on MPEG audio^[28] was finalized in 1994 as part of the second suite of MPEG standards, MPEG-2, more formally known as international standard ISO/IEC 13818-3 (a.k.a. MPEG-2 Part 3 or backwards compatible MPEG-2 Audio or MPEG-2 Audio BC^[11]), originally published in 1995.^[6][29] MPEG-2 Part 3 (ISO/IEC 13818-3) defined additional bit rates and sample rates for MPEG-1 Audio Layer I, II and III. The new sampling rates are exactly half that of those originally defined for MPEG-1 Audio. MPEG-2 Part 3 also enhanced MPEG-1's audio by allowing the coding of audio programs with more than two channels, up to 5.1 multichannel.^[28] There is also MPEG-2.5 audio, a proprietary unofficial extension developed by Fraunhofer IIS. It enables MP3 to work satisfactorily at very low bitrates and added lower sampling frequencies.^[30][31] MPEG-2.5 was not developed by MPEG and was never approved as an international standard.

• Note: The ISO standard ISO/IEC 11172-3 (a.k.a. MPEG-1 Audio) defined three formats: the MPEG-1 Audio Layer I, Layer II and Layer III. The ISO standard ISO/IEC 13818-3 (a.k.a. MPEG-2 Audio) defined extended version of the MPEG-1 Audio – MPEG-2 Audio Layer I, Layer II and Layer III. MPEG-2 Audio (MPEG-2 Part 3) should not be confused with MPEG-2 AAC (MPEG-2 Part 7 – ISO/IEC 13818-7).^[11]

Compression efficiency of encoders is typically defined by the bit rate, because compression ratio depends on the bit depth and sampling rate of the input signal. Nevertheless, compression ratios are often published. They may use the Compact Disc (CD) parameters as references (44.1 kHz, 2 channels at 16 bits per channel or 2×16 bit), or sometimes the Digital Audio Tape (DAT) SP parameters (48 kHz, 2×16 bit). Compression ratios with this latter reference are higher, which demonstrates the problem with use of the term compression ratio for lossy encoders.

Karlheinz Brandenburg used a CD recording of Suzanne Vega's song "Tom's Diner" to assess and refine the MP3 compression algorithm. This song was chosen because of its nearly monophonic nature and wide spectral content, making it easier to hear imperfections in the compression format during playbacks. Some jokingly refer to Suzanne Vega as "The mother of MP3".^[33] Some more critical audio excerpts (glockenspiel, triangle, accordion, etc.) were taken from the EBU V3/SQAM reference compact disc and have been used by professional sound engineers to assess the subjective quality of the MPEG Audio formats. This particular track has an interesting property in that the two channels are almost, but not completely, the same, leading to a case where Binaural Masking Level Depression causes spatial unmasking of noise artifacts unless the encoder properly recognizes the situation and applies corrections similar to those detailed in the MPEG-2 AAC psychoacoustic model.

Going public[link]

A reference simulation software implementation, written in the C language and later known as ISO 11172-5, was developed (in 1991–1996) by the members of the ISO MPEG Audio committee in order to produce bit compliant MPEG Audio files (Layer 1, Layer 2, Layer 3). It was approved as a committee draft of ISO/IEC technical report in March 1994 and printed as document CD 11172-5 in April 1994.^[34] It was approved as a draft technical report (DTR/DIS) in November 1994,^[35] finalized in 1996 and published as international standard ISO/IEC TR 11172-5:1998 in 1998.^[36] The reference software in C language was later published as a freely available ISO standard.^[37] Working in non-real time on a number of operating systems, it was able to demonstrate the first real time hardware decoding (DSP based) of compressed audio. Some other real time implementation of MPEG Audio encoders were available for the purpose of digital broadcasting (radio DAB, television DVB) towards consumer receivers and set top boxes.

On July 7, 1994, the Fraunhofer Society released the first software MP3 encoder called l3enc.^[38] The filename extension .mp3 was chosen by the Fraunhofer team on July 14, 1995 (previously, the files had been named .bit).^[1] With the first real-time software MP3 player Winplay3 (released September 9, 1995) many people were able to encode and play back MP3 files on their PCs. Because of the relatively small hard drives back in that time (~ 500–1000 MB) lossy compression was essential to store non-instrument based (see tracker and MIDI) music for playback on computer.

Internet[link]

In the second half of 1994, MP3 files began to spread on the Internet. The popularity of MP3s began to rise rapidly with the advent of Nullsoft's audio player Winamp, released in 1997. In 1998, the first portable solid state digital audio player MPMan, developed by SaeHan Information Systems which is headquartered in Seoul, South Korea, was released and the Rio PMP300 was sold afterwards, despite legal suppression efforts by the RIAA.^[39]

In November 1997, the website mp3.com was offering thousands of MP3s created by independent artists for free.^[39] The small size of MP3 files enabled widespread peer-to-peer file sharing of music ripped from CDs, which would have previously been nearly impossible. The first large peer-to-peer filesharing network, Napster, was launched in 1999.

The ease of creating and sharing MP3s resulted in widespread copyright infringement. Major record companies argued that this free sharing of music reduced sales, and called it "music piracy". They reacted by pursuing lawsuits against Napster (which was eventually shut down and later sold) and against individual users who engaged in file sharing.

Despite the popularity of the MP3 format, online music retailers often use other proprietary formats that are encrypted or obfuscated in order to make it difficult to use purchased music files in ways not specifically authorized by the record companies. Attempting to control the use of files in this way is known as Digital Rights Management. Record companies argue that this is necessary to prevent the files from being made available on peer-to-peer file sharing networks. This has other side effects, though, such as preventing users from playing back their purchased music on different types of devices. However, the audio content of these files can usually be converted into an unencrypted format. For instance, users are often allowed to burn files to audio CD, which requires conversion to an unencrypted audio format.

Unauthorized MP3 file sharing continues on next-generation peer-to-peer networks. Some authorized services, such as Beatport, Bleep, Juno Records, eMusic, Zune Marketplace, Walmart.com, Rhapsody, the legal incarnation of Napster, and Amazon.com sell unrestricted music in the MP3 format.

Encoding audio[link]

The MPEG-1 standard does not include a precise specification for an MP3 encoder, but does provide example psychoacoustic models, rate loop, and the like in the non-normative part of the original standard.^[40] At present, these suggested implementations are quite dated. Implementers of the standard were supposed to devise their own algorithms suitable for removing parts of the information from the audio input. As a result, there are many different MP3 encoders available, each producing files of differing quality. Comparisons are widely available, so it is easy for a prospective user of an encoder to research the best choice. It must be kept in mind that an encoder that is proficient at encoding at higher bit rates (such as LAME) is not necessarily as good at lower bit rates.

During encoding, 576 time-domain samples are taken and are transformed to 576 frequency-domain samples. If there is a transient, 192 samples are taken instead of 576. This is done to limit the temporal spread of quantization noise accompanying the transient. (See psychoacoustics.)

Decoding audio[link]

Decoding, on the other hand, is carefully defined in the standard. Most decoders are "bitstream compliant", which means that the decompressed output – that they produce from a given MP3 file – will be the same, within a specified degree of rounding tolerance, as the output specified mathematically in the ISO/IEC high standard document (ISO/IEC 11172-3). Therefore, comparison of decoders is usually based on how computationally efficient they are (i.e., how much memory or CPU time they use in the decoding process).

Audio quality[link]

When performing lossy audio encoding, such as creating an MP3 file, there is a trade-off between the amount of space used and the sound quality of the result. Typically, the creator is allowed to set a bit rate, which specifies how many kilobits the file may use per second of audio. The higher the bit rate, the larger the compressed file will be, and, generally, the closer it will sound to the original file.

With too low a bit rate, compression artifacts (i.e., sounds that were not present in the original recording) may be audible in the reproduction. Some audio is hard to compress because of its randomness and sharp attacks. When this type of audio is compressed, artifacts such as ringing or pre-echo are usually heard. A sample of applause compressed with a relatively low bit rate provides a good example of compression artifacts.

Besides the bit rate of an encoded piece of audio, the quality of MP3 files also depends on the quality of the encoder itself, and the difficulty of the signal being encoded. As the MP3 standard allows quite a bit of freedom with encoding algorithms, different encoders may feature quite different quality, even with identical bit rates. As an example, in a public listening test featuring two different MP3 encoders at about 128 kbit/s,^[41] one scored 3.66 on a 1–5 scale, while the other scored only 2.22.

Quality is dependent on the choice of encoder and encoding parameters.^[42]

The simplest type of MP3 file uses one bit rate for the entire file — this is known as Constant Bit Rate (CBR) encoding. Using a constant bit rate makes encoding simpler and faster. However, it is also possible to create files where the bit rate changes throughout the file. These are known as Variable Bit Rate (VBR) files. The idea behind this is that, in any piece of audio, some parts will be much easier to compress, such as silence or music containing only a few instruments, while others will be more difficult to compress. So, the overall quality of the file may be increased by using a lower bit rate for the less complex passages and a higher one for the more complex parts. With some encoders, it is possible to specify a given quality, and the encoder will vary the bit rate accordingly. Users who know a particular "quality setting" that is transparent to their ears can use this value when encoding all of their music, and generally speaking not need to worry about performing personal listening tests on each piece of music to determine the correct bit rate.

Perceived quality can be influenced by listening environment (ambient noise), listener attention, and listener training and in most cases by listener audio equipment (such as sound cards, speakers and headphones).

A test given to new students by Stanford University Music Professor Jonathan Berger showed that student preference for MP3 quality music has risen each year. Berger said the students seem to prefer the 'sizzle' sounds that MP3s bring to music.^[43]

Bit rate[link]

Several bit rates are specified in the MPEG-1 Audio Layer III standard: 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256 and 320 kbit/s, and the available sampling frequencies are 32, 44.1 and 48 kHz.^[31] Additional extensions were defined in MPEG-2 Audio Layer III: bit rates 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160 kbit/s and sampling frequencies 16, 22.05 and 24 kHz.^[31]

A sample rate of 44.1 kHz is almost always used, because this is also used for CD audio, the main source used for creating MP3 files. A greater variety of bit rates are used on the Internet. The rate of 128 kbit/s is commonly used,^[44] at a compression ratio of 11:1, offering adequate audio quality in a relatively small space. As Internet bandwidth availability and hard drive sizes have increased, higher bit rates up to 320 kbit/s are widespread.

Uncompressed audio as stored on an audio-CD has a bit rate of 1,411.2 kbit/s,^{[note 2]} so the bitrates 128, 160 and 192 kbit/s represent compression ratios of approximately 11:1, 9:1 and 7:1 respectively.

Non-standard bit rates up to 640 kbit/s can be achieved with the LAME encoder and the freeformat option, although few MP3 players can play those files. According to the ISO standard, decoders are only required to be able to decode streams up to 320 kbit/s.^[45]

VBR[link]

MPEG audio may use variable bitrate (VBR), accomplished via bitrate switching on a per-frame basis, but only layer III decoders must support it.^{[31][47][48][49]} VBR is used when the goal is to achieve a fixed level of quality. The final file size of a VBR encoding is less predictable than with constant bitrate. Average bitrate is VBR implemented as a compromise between the two – the bitrate is allowed to vary for more consistent quality, but is controlled to remain near an average value chosen by the user, for predictable file sizes. Although an MP3 decoder must support VBR to be standards compliant, historically some decoders have bugs with VBR decoding, particularly before VBR encoders became widespread.

Layer III audio can also use a "bit reservoir", a partially full frame's ability to hold part of the next frame's audio data, allowing temporary changes in effective bitrate, even in a constant bitrate stream.^[31][47]

File structure[link]

An MP3 file is made up of multiple MP3 frames, which consist of a header and a data block. This sequence of frames is called an elementary stream. Frames are not independent items ("byte reservoir") and therefore cannot be extracted on arbitrary frame boundaries. The MP3 Data blocks contain the (compressed) audio information in terms of frequencies and amplitudes. The diagram shows that the MP3 Header consists of a sync word, which is used to identify the beginning of a valid frame. This is followed by a bit indicating that this is the MPEG standard and two bits that indicate that layer 3 is used; hence MPEG-1 Audio Layer 3 or MP3. After this, the values will differ, depending on the MP3 file. ISO/IEC 11172-3 defines the range of values for each section of the header along with the specification of the header. Most MP3 files today contain ID3 metadata, which precedes or follows the MP3 frames; as noted in the diagram.

[edit] Design limitations

There are several limitations inherent to the MP3 format that cannot be overcome by any MP3 encoder. Newer audio compression formats such as AAC, WMA Pro and Vorbis are generally void of a number of these limitations.^[50] In technical terms, some limitations include:

• Time resolution can be too low for highly transient signals and may cause smearing of percussive sounds.^[51]
• Due to the tree structure of the filter bank, pre-echo problems are made worse, as the combined impulse response of the two filter banks does not, and cannot, provide an optimum solution in time/frequency resolution.^[51]
• The combining of the two filter banks' outputs creates aliasing problems that must be handled partially by the "aliasing compensation" stage; however, that creates excess energy to be coded in the frequency domain, thereby decreasing coding efficiency.^{[citation needed]}
• Frequency resolution is limited by the small long block window size, which decreases coding efficiency.^[51]
• There is no scale factor band for frequencies above 15.5/15.8 kHz.^{[original research?]}
• Joint stereo is done only on a frame-to-frame basis.^[51]
• Internal handling of the bit reservoir increases encoding delay.^{[citation needed]}
• Encoder/decoder overall delay is not defined, which means there is no official provision for gapless playback. However, some encoders such as LAME can attach additional metadata that will allow players that can handle it to deliver seamless playback.
• The data stream can contain an optional checksum, but the checksum only protects the header data, not the audio data.

ID3 and other tags[link]

Main articles: ID3 and APEv2 tag

A "tag" in an audio file is a section of the file that contains metadata such as the title, artist, album, track number or other information about the file's contents. The MP3 standards do not define tag formats for MP3 files, nor is there a standard container format that would support metadata and obviate the need for tags.

However, several de facto standards for tag formats exist. As of 2010, the most widespread are ID3v1 and ID3v2, and the more recently introduced APEv2. These tags are normally embedded at the beginning or end of MP3 files, separate from the actual MP3 frame data. MP3 decoders normally either read info from the tags, or just treat them as ignorable, non-MP3 junk data.

Playing & editing software often contains tag editing functionality, but there are also tag editor applications dedicated to the purpose.

Aside from metadata pertaining to the audio content, tags may also be used for DRM.^{[citation needed]}

Volume normalization[link]

Since volume levels of different audio sources can vary greatly, due to the loudness war and other factors, it is sometimes desirable to adjust the playback volume of audio files such that a consistent average loudness is perceived. This normalization, while similar in purpose, is distinct from dynamic range compression.

ReplayGain is one standard for measuring and storing the loudness of an MP3 file in its metadata tag, enabling a ReplayGain-compliant player to automatically adjust the overall playback volume for each file. MP3Gain may be used to reversibly modify files based on ReplayGain measurements so that adjusted playback can be achieved on players without ReplayGain capability.

[edit] Licensing and patent issues

Many organizations have claimed ownership of patents related to MP3 decoding or encoding. These claims have led to a number of legal threats and actions from a variety of sources, resulting in uncertainty about which patents must be licensed in order to create MP3 products without committing patent infringement in countries that allow software patents.

The various MP3-related patents expire on dates ranging from 2007 to 2017 in the U.S.^[52] The initial near-complete MPEG-1 standard (parts 1, 2 and 3) was publicly available on December 6, 1991 as ISO CD 11172.^[53][54] In the United States, patents cannot claim inventions that were already publicly disclosed more than a year prior to the filing date, but for patents filed prior to June 8, 1995, submarine patents made it possible to extend the effective lifetime of a patent through application extensions. Patents filed for anything disclosed in ISO CD 11172 a year or more after its publication are questionable; if only the known MP3 patents filed by December 1992 are considered, then MP3 decoding may be patent free in the US by September 2015 when U.S. Patent 5,812,672 expires which had a PCT filing in Oct 1992.^[55][56][57]

Technicolor (formerly called Thomson Consumer Electronics) claims to control MP3 licensing of the Layer 3 patents in many countries, including the United States, Japan, Canada and EU countries.^[58] Technicolor has been actively enforcing these patents.^[59]

MP3 license revenues generated about €100 million for the Fraunhofer Society in 2005.^[60]

In September 1998, the Fraunhofer Institute sent a letter to several developers of MP3 software stating that a license was required to "distribute and/or sell decoders and/or encoders". The letter claimed that unlicensed products "infringe the patent rights of Fraunhofer and Thomson. To make, sell and/or distribute products using the [MPEG Layer-3] standard and thus our patents, you need to obtain a license under these patents from us."^[61]

However, there exist both free and/or proprietary alternatives, with free formats such as Vorbis, FLAC, and others. Microsoft's usage of its own proprietary Windows Media format allows it to avoid licensing issues associated with these patents by avoiding usage of the MP3 format entirely. Until the key patents expire, unlicensed encoders and players could be infringing in countries where the patents are valid.

In spite of the patent restrictions, the perpetuation of the MP3 format continues. The reasons for this appear to be the network effects caused by:

• familiarity with the format
• the large quantity of music now available in the MP3 format
• the wide variety of existing software and hardware that takes advantage of the file format and does not support the alternatives
• the lack of DRM restrictions, which makes MP3 files easy to edit, copy and play in different portable digital players (Apple, Creative, Samsung, etc.)
• the majority of home users not knowing or not caring about the patents' existence and often not considering such legal issues when choosing their music format for personal use

Additionally, patent holders declined to enforce license fees on free and open source decoders, which allows many free MP3 decoders to develop.^{[citation needed]}

Sisvel S.p.A. and its U.S. subsidiary Audio MPEG, Inc. previously sued Thomson for patent infringement on MP3 technology,^[62] but those disputes were resolved in November 2005 with Sisvel granting Thomson a license to their patents. Motorola also recently signed with Audio MPEG to license MP3-related patents.

In September 2006, German officials seized MP3 players from SanDisk's booth at the IFA show in Berlin after an Italian patents firm won an injunction on behalf of Sisvel against SanDisk in a dispute over licensing rights. The injunction was later reversed by a Berlin judge,^[63] but that reversal was in turn blocked the same day by another judge from the same court, "bringing the Patent Wild West to Germany" in the words of one commentator.^[64]

In February 2007, Texas MP3 Technologies sued Apple, Samsung Electronics and Sandisk in eastern Texas federal court, claiming infringement of a portable MP3 player patent that Texas MP3 said it had been assigned. Apple and Sandisk both settled the claims against them in January 2009.^[65] Samsung settled as well.^[66]

Alcatel-Lucent has asserted several MP3 coding and compression patents, allegedly inherited from AT&T-Bell Labs, in litigation of its own. In November 2006, before the companies' merger, Alcatel sued Microsoft for allegedly infringing seven patents. On February 23, 2007, a San Diego jury awarded Alcatel-Lucent US $1.52 billion in damages for infringement of two of them.^[67] The court subsequently tossed the award, however, finding that one patent had not been infringed and that the other was not even owned by Alcatel-Lucent; it was co-owned by AT&T and Fraunhofer, who had licensed it to Microsoft, the judge ruled.^[68] That defense judgment was upheld on appeal in 2008.^[69] See Alcatel-Lucent v. Microsoft for more information.

Alternative technologies[link]

Many other lossy and lossless audio codecs exist. Among these, mp3PRO, AAC, and MP2 are all members of the same technological family as MP3 and depend on roughly similar psychoacoustic models. The Fraunhofer Gesellschaft owns many of the basic patents underlying these codecs as well, with others held by Dolby Labs, Sony, Thomson Consumer Electronics, and AT&T. In addition, there is also the open source file format Vorbis that has been available free of charge and without any known patent restrictions.

See also[link]

Audio compression (data) Comparison of audio codecs Copyright infringement Digital audio player DJ digital controller Podcast

Information technology portal LRC (file format) Media player MP3 blog MP3 Surround MP3HD Streaming media MPEG

Notes[link]

References[link]

External links[link]

• MP3 at the Open Directory Project
• MP3-history.com, The Story of MP3 — How MP3 was invented, by Fraunhofer IIS
• MPEG.chiariglione.org, MPEG Official Web site
• Wiki.HydrogenAudio.org, MP3
• RFC 3119, A More Loss-Tolerant RTP Payload Format for MP3 Audio
• RFC 3003, The audio/mpeg Media Type

Britney Spears
Spears performing at her Femme Fatale Tour in Europe, 2011
Background information
Birth name	Britney Jean Spears
Born	(1981-12-02) December 2, 1981 (age 30) McComb, Mississippi, U.S.
Genres	Pop, dance
Occupations	Singer, songwriter, dancer, actress, record producer, author, fashion designer, video director
Instruments	Vocals, piano
Years active	1992–present
Labels	Jive, RCA[1]
Associated acts	The New Mickey Mouse Club
Website	britneyspears.com britney.com

Britney Jean Spears (born December 2, 1981) is an American recording artist and entertainer. Born in McComb, Mississippi, and raised in Kentwood, Louisiana, Spears began performing as a child, landing acting roles in stage productions and television shows. She signed with Jive Records in 1997 and released her debut album ...Baby One More Time in 1999, which became the best-selling album by a teenage solo artist.^[2] During her first decade in the music industry, she became a prominent figure in mainstream popular music and popular culture, followed by a much-publicized personal life. Her first two albums established her as a pop icon and broke sales records, while title tracks "...Baby One More Time" and "Oops!... I Did It Again" became international number-one hits. Spears was credited with influencing the revival of teen pop during the late 1990s, and became the 'best-selling teen aged artist of all time' before she turned 20,^[3] garnering her the honorific title of "Princess of Pop".^[4]

In 2001, she released her third studio album Britney and expanded her brand, playing the starring role in the film Crossroads. She assumed creative control of her fourth studio album, In the Zone (2003), which yielded chart-topping singles "Me Against the Music", "Toxic" and "Everytime". After the release of two compilation albums, Spears experienced personal struggles and her career went into hiatus. Her fifth studio album, Blackout, was released in 2007 and despite receiving little promotion, it spawned hits "Gimme More" and "Piece of Me". In 2008, her erratic behavior and hospitalizations caused her to be placed in a conservatorship. The same year, her sixth studio album Circus was released, with the global chart-topping lead single "Womanizer", and hits such as "Circus" and "If U Seek Amy". She embarked on her highest-grossing global concert tour,^[5] The Circus Starring Britney Spears, in 2009. In October of the same year, she released a chart-topping single, "3", which became her third single to reach number one on the Billboard Hot 100. Her seventh studio album Femme Fatale, released in 2011, has become the first of her albums to yield three top ten singles in the United States, "Hold It Against Me", "Till the World Ends" and "I Wanna Go". The same year, she also gained her fifth number one single when she featured on the remix of "S&M" alongside Rihanna.

Spears work has earned her numerous awards and accolades, including a Grammy Award, 6 MTV Video Music Awards including the Lifetime Achievement Award, 9 Billboard Music Awards, and a star on the Hollywood Walk of Fame. In 2009, Billboard ranked her as the 8th overall Artist of the Decade,^[6] and also recognized her as the best-selling female artist of the first decade of the 21st century, as well as the fifth overall.^[7] The Recording Industry Association of America (RIAA) also recognized Spears as the eighth top-selling female artist in the United States, with 33 million certified albums.^[8] Nielsen SoundScan ranked Spears the tenth best-selling digital artist of the country, with more than 28.6 million digital singles as of January 2012.^[9] She has sold over 100 million albums worldwide, making her one of the best-selling music artists of all time.^[10] Rolling Stone recognized her instant success as one of the Top 25 Teen Idol Breakout Moments of all time,^[11] while VH1 ranked her eleventh on their "100 Greatest Women in Music" list in 2012.^[12] Forbes also revealed that Spears was the sixth most powerful celebrity, and the third best paid musician of 2011-12, having topped the list back in 2002.^[13] In Fall 2012, Spears will serve as a judge in the second season of the American version of The X Factor.^[14]

Biography[link]

1981–97: Early life, and career beginnings[link]

Britney Jean Spears was born on December 2, 1981, the second child of Lynne Irene (née Bridges) and James Parnell Spears. She is of English heritage through her maternal grandmother, Lillian Portelli who was born in London, and of distant Maltese and Sicilian (Sicani) descent.^[15][16][17] Her siblings are Bryan James and Jamie Lynn.^[18] At age three, she started to attend dance lessons in her hometown of Kentwood, Louisiana, and was selected to perform as a solo artist at the annual recital. During her childhood, she also attended gymnastics and voice lessons, and won many state-level competitions and children's talent shows.^[19][20][21] Spears made her local stage debut at age five, singing "What Child Is This?" at her kindergarten graduation. She said about her ambition as a child, "I was in my own world, [...] I found out what I'm supposed to do at an early age".^[20] At age eight, Spears and her mother Lynne traveled to Atlanta for an audition in the 1990s revival of The Mickey Mouse Club. Casting director Matt Casella rejected her for being too young to join the series at the time, but introduced her to Nancy Carson, a New York City talent agent. Carson was impressed with Spears's vocals and suggested enrolling her at the Professional Performing Arts School; shortly after, Lynne and her daughters moved to a sublet apartment in New York. Spears was hired for her first professional role as the understudy for the lead role of Tina Denmark in the Off-Broadway musical Ruthless!. She also appeared as a contestant on the popular television show Star Search, as well as being cast in a number of commercials.^[22][23] In December 1992, she was finally cast in The Mickey Mouse Club, but returned to Kentwood after the show was canceled. She enrolled at Parklane Academy in nearby McComb, Mississippi. Although she made friends with most of her classmates, she compared the school to "the opening scene in Clueless with all the cliques. [...] I was so bored. I was the point guard on the basketball team. I had my boyfriend, and I went to homecoming and Christmas formal. But I wanted more."^[20][24]

In June 1997, Spears was in talks with manager Lou Pearlman to join the female pop group Innosense. Lynne asked family friend and entertainment lawyer Larry Rudolph for his opinion and submitted a tape of Spears singing over a Whitney Houston karaoke song along with some pictures. Rudolph decided he wanted to pitch her to record labels, therefore she needed a professional demo. He sent Spears an unused song of Toni Braxton; she rehearsed for a week and recorded her vocals in a studio with a sound engineer. Spears traveled to New York with the demo and met with executives from four labels, returning to Kentwood the same day. Three of the labels rejected her, arguing that audiences wanted pop bands such as the Backstreet Boys and the Spice Girls, and "there wasn't going to be another Madonna, another Debbie Gibson, or another Tiffany." Two weeks later, executives from Jive Records returned calls to Rudolph.^[25] Senior vice president of A&R Jeff Fenster stated about Spears's audition that "It's very rare to hear someone that age who can deliver emotional content and commercial appeal. [...] For any artist, the motivation—the 'eye of the tiger'—is extremely important. And Britney had that."^[20] She then sang Houston's "I Have Nothing" (1992) for the executives, and got signed to the label.^[26] They appointed her to work with producer Eric Foster White for a month, who reportedly shaped her voice from "lower and less poppy" delivery to "distinctively, unmistakably Britney."^[27] After hearing the recorded material, president Clive Calder ordered a full album. Spears had originally envisioned "Sheryl Crow music, but younger more adult contemporary" but felt all right with her label's appointment of producers, since "It made more sense to go pop, because I can dance to it—it's more me." She flew to Cheiron Studios in Stockholm, Sweden, where half of the album was recorded from March to April 1998, with producers Max Martin, Denniz Pop and Rami Yacoub, among others.^[20]

[edit] 1998–2000: ...Baby One More Time, and Oops!... I Did It Again

After Spears returned to the United States, she embarked on a shopping mall promotional tour to promote her forthcoming album. Her show was a four song set and she was accompanied by two back up dancers. Her first concert tour followed, as an opening act for 'N Sync.^[28] Her debut album, ...Baby One More Time, was released on January 1999.^[29] It debuted at number one on the U.S. Billboard 200 and was certified two-times platinum by the Recording Industry Association of America after a month. Worldwide, the album topped the charts in fifteen countries and sold over ten million copies in a year.^[30] It became the biggest selling album ever by a teenage artist.^[21] The title track was released as the lead single from the album. Originally, Jive Records wanted its music video to be animated; however, Spears rejected it, and suggested the final idea of a Catholic schoolgirl.^[27] The single sold 500,000 copies on its first day, and peaked at number one on the Billboard Hot 100, topping the chart for two consecutive weeks.^[31][32] "...Baby One More Time" later received a Grammy nomination for Best Female Pop Vocal Performance.^[33] The title track also topped the singles chart for two weeks in the United Kingdom, and became the fastest-selling single ever by a female artist, shipping over 460,000 copies.^[34] It would later become the 25th most successful song of all time in British chart history.^[35] Spears is also the youngest female artist to have a million seller in the country.^[36] "(You Drive Me) Crazy" was released as the third single from the album. It became a top-ten hit worldwide and propelled ...Baby One More Time to sell 26 million copies.^[37]

The April 1999 cover of Rolling Stone featured Spears lying on her bed, clad with a bra, shorts and an open top. The American Family Association (AFA) referred to the shoot as "a disturbing mix of childhood innocence and adult sexuality" and called to "God-loving Americans to boycott stores selling Britney's albums." Spears responded to the outcry commenting, "What's the big deal? I have strong morals. [...] I'd do it again. I thought the pictures were fine. And I was tired of being compared to Debbie Gibson and all of this bubblegum pop all the time."^[38] Shortly before, Spears had announced publicly she would remain a virgin until marriage.^[21] On June 28, 1999, Spears began her first headlining ...Baby One More Time Tour in North America, which was positively received by critics,^[39] but generated some controversy due to her racy outfits.^[40] An extension of the tour, titled Crazy 2k, followed in March 2000. Spears premiered songs from her upcoming second album during the show.^[24]

Oops!... I Did It Again, her second studio album, was released in May 2000. It debuted at number one in the US, selling 1,3 million copies, breaking the SoundScan record for the highest debut sales by any solo artist.^[41] The album sold over 20 million copies worldwide.^[42] Rob Sheffield of Rolling Stone said that "the great thing about Oops! – under the cheese surface, Britney's demand for satisfaction is complex, fierce and downright scary, making her a true child of rock & roll tradition."^[43] The album's lead single, "Oops!... I Did It Again", peaked at the top of the charts in Australia, New Zealand, the United Kingdom and many other European nations.^[36][44] The album as well as the title track received Grammy nominations for Best Pop Vocal Album and Best Female Pop Vocal Performance, respectively.^[45]

The same year, Spears embarked on the Oops!... I Did It Again World Tour, which grossed $40.5 million; she also released her first book, Britney Spears' Heart-to-Heart, co-written with her mother.^[21][46] On September 7, 2000, Spears performed at the 2000 MTV Video Music Awards. Halfway through the performance, she ripped off her black suit to reveal a sequined flesh-colored bodysuit, followed by heavy dance routine. It is noted by critics as the moment that Spears showed signs of becoming a more provocative performer.^[47] Amidst media speculation, Spears confirmed she was dating 'N Sync member Justin Timberlake.^[21]

[edit] 2001–03: Britney, Crossroads, and In the Zone

Spears performing at the NFL Kickoff Live in 2003.

In February 2001, Spears signed a $7–8 million promotional deal with Pepsi, and released another book co-written with her mother, entitled A Mother’s Gift.^[21] Her third studio album, Britney, was released in November 2001. While on tour, she felt inspired by hip hop artists such as Jay-Z and The Neptunes and wanted to create a record with a funkier sound.^[48] The album debuted at number one in the Billboard 200 and reached top five positions in Australia, the United Kingdom and mainland Europe and sold over 12 million copies worldwide.^[36][49][50] Stephen Thomas Erlewine of Allmusic called Britney "the record where she strives to deepen her persona, making it more adult while still recognizably Britney. [...] It does sound like the work of a star who has now found and refined her voice, resulting in her best record yet."^[51] The album was honored with two Grammy nominations—Best Pop Vocal Album and Best Female Pop Vocal Performance for "Overprotected"— and was listed in 2008 as one of Entertainment Weekly's "100 Best Albums from the Past 25 Years".^[52][53] The album's first single, "I'm a Slave 4 U", became a top-ten hit worldwide.^[54]

Spears's performance of the single at the 2001 MTV Video Music Awards featured a caged tiger and a large albino python draped over her shoulders. It was harshly received by animal rights organization PETA, who claimed the animals were mistreated and scrapped plans for an anti-fur billboard that was to feature Spears.^[47] To support the album, Spears embarked on the Dream Within a Dream Tour. The show was critically praised for its technical innovations, the pièce de résistance being a water screen that pumped two tons of water into the stage.^[55][56] The tour grossed $43.7 million, becoming the second highest grossing tour of 2002 by a female artist, behind Cher's Farewell Tour.^[57] Her career success was highlighted by Forbes in 2002, as Spears was ranked the world's most powerful celebrity.^[58] Spears also landed her first starring role in Crossroads, released in February 2002. Although the film was largely panned, most critics actually praised Spears's acting.^[59][60][61] Crossroads, which had a $11 million budget, went on to gross over $57 million worldwide.^[61]

In June 2002, Spears opened her first restaurant, Nyla, in New York City, but terminated her relationship in November, citing mismanagement and "management's failure to keep her fully apprised".^[62] In July 2002, Spears announced she would take a six month break from her career; however, she went back into the studio in November to record her new album.^[63] Spears' relationship with Justin Timberlake ended after three years. In December 2002, Timberlake released the song "Cry Me a River" as the second single from his solo debut album. The music video featured a Spears look-alike and fueled the rumors that she had been unfaithful to him.^[64][65] As a response, Spears wrote the ballad "Everytime" with her backing vocalist and friend Annet Artani.^[66] The same year, Limp Bizkit frontman Fred Durst said that he was in a relationship with Spears. However, Spears denied Durst's claims.^[67] In a 2009 interview, he explained that "I just guess at the time it was taboo for a guy like me to be associated with a gal like her."^[67] Spears opened the 2003 MTV Video Music Awards with Christina Aguilera, performing "Like a Virgin". Halfway through they were joined by Madonna, with whom they both kissed. The incident was highly publicized.^[61]

Spears released her fourth studio album, In the Zone, in November 2003. She assumed more creative control by writing and co-producing most of the material.^[21] Vibe called it "A supremely confident dance record that also illustrates Spears's development as a songwriter."^[68] NPR listed the album as one of "The 50 Most Important Recording of the Decade", adding that "the decade's history of impeccably crafted pop is written on her body of work."^[69] In the Zone sold over 609,000 copies in the United States and debuted at the top of the charts, making Spears the first female artist in the SoundScan era to have her first four studio albums to debut at number one.^[21] It also debuted at the top of the charts in France and the top ten in Belgium, Denmark, Sweden and the Netherlands.^[70] In the Zone sold over 10 million copies worldwide.^[71] The album produced the hit singles: "Me Against the Music", a collaboration with Madonna; "Toxic"—which won Spears her first and only Grammy for Best Dance Recording; "Everytime" and "Outrageous".^[21]

[edit] 2004–07: Compilation albums, motherhood, personal struggles, and Blackout

Spears performing live on The Onyx Tour in 2004

On January 3, 2004, Spears married childhood friend Jason Allen Alexander at The Little White Wedding Chapel in Las Vegas. The marriage was annulled 55 hours later, stating that Spears "lacked understanding of her actions".^[72] She began The Onyx Hotel Tour in support of In the Zone in March 2004.^[73] On June 8, 2004, Spears fell and injured her left knee during the music video shoot for "Outrageous". She was taken immediately to a local hospital, where doctors performed an MRI scan and found floating cartilage. The following day, Spears underwent arthroscopic surgery. She was forced to remain six weeks with a thigh brace, followed by eight to twelve weeks of rehabilitation, which caused The Onyx Hotel Tour to be canceled.^[74] During 2004, Spears became involved in the Kabbalah Centre through her friendship with Madonna.^[75]

In July 2004, she announced her engagement to American dancer Kevin Federline, whom she had met three months before. The romance received intense attention from the media, since Federline had recently broken up with actress Shar Jackson, who was still pregnant with their second child at the time.^[21] The initial stages of their relationship were chronicled in Spears's first reality show Britney & Kevin: Chaotic. They held a wedding ceremony on September 18, 2004, but were not legally married until three weeks later on October 6 due to a delay finalizing the couple's prenuptial agreement.^[76] Shortly after, she released her first fragrance with Elizabeth Arden, Curious, which broke the company's first-week gross for a perfume.^[21] In October 2004, Spears announced she would be taking another career break to start a family.^[77] Greatest Hits: My Prerogative, her first greatest hits compilation album, was released in November 2004.^[78] Spears's cover version of Bobby Brown's "My Prerogative" was released as the lead single from the album, reaching the top of the charts in Finland, Ireland, Italy and Norway.^[79] The second single, "Do Somethin'", was a top ten hit in Australia, the United Kingdom and other countries of mainland Europe.^[80][81] Worldwide, Greatest Hits: My Prerogative sold over 5 million copies.^[82] In late 2004, Spears went on KIIS-FM radio in Los Angeles, CA to play a new demo titled "Mona Lisa." The demo was to be the first single from an upcoming album called the "Original Doll." However, Spears' label later cancelled the album for unknown reasons.^[83][84] Spears gave birth to her first child, Sean Preston Federline, on September 14, 2005.^[85]

In November 2005, she released her first remix compilation, B in the Mix: The Remixes, which consists of eleven remixes.^[86] It has sold over 1 million copies worldwide, making it one of the best selling remix albums of all time.^[87] In February 2006, pictures surfaced of Spears driving with her son Sean, on her lap instead of in a car seat. Child advocates were horrified by the photos of her holding the wheel with one hand and Sean with the other. Spears claimed that the situation happened because of a frightening encounter with paparazzi, and that it was a mistake on her part.^[21] The following month, she guest-starred on the Will & Grace episode "Buy, Buy Baby" as closeted lesbian Amber Louise.^[88] She publicly announced she no longer studied Kabbalah in June 2006, explaining, "my baby is my religion."^[75] Two months later, Spears posed nude for the cover of Harper's Bazaar. The picture was heavily compared to Demi Moore's August 1991 Vanity Fair cover.^[21] She gave birth to her second child, Jayden James Federline, on September 12, 2006.^[89] On November 7, 2006, Spears filed for divorce from Federline, citing irreconcilable differences.^[90] Their divorce was finalized in July 2007, when the couple reached a global settlement and agreed to share joint custody of their children.^[91] Spears's aunt Sandra Bridges Covington, with whom she had been very close, died of ovarian cancer in January.^[92] On February 16, 2007, Spears stayed in a drug rehabilitation facility in Antigua for less than a day. The following night, she shaved her head with electric clippers at a hair salon in Tarzana, Los Angeles. She admitted herself to other treatment facilities during the following weeks.^[93] After completing a month-long program at Promises, she wrote on her website, "I truly hit rock bottom. Till this day I don't think that it was alcohol or depression. [...] was like a bad kid running around with ADD."^[21] In May 2007, she produced a series of promotional concerts at House of Blues venues, titled The M+M's Tour.^[94] Spears lost physical custody of her children to Federline on October 1, 2007. The reasons of the court ruling were not revealed to the public.^[95] Also, in 2007 Spears was sued by Louis Vuitton over her 2005 music video "Do Something" for pimping out her Hummer interior in counterfiet Louis Vuitton cherry blossom fabric. Which resulted in her video being banned on European TV stations.^[96]

Her fifth studio album, Blackout, was released in October 2007. It debuted at the top of charts in Canada and Ireland, number two in the U.S. Billboard 200,—held off from the top spot by Eagles's Long Road out of Eden— France, Japan, Mexico and the United Kingdom and the top ten in Australia, Korea, New Zealand and many European nations. In the United States, Spears became the only female artist to have her first five studio albums debut at the two top slots of the chart.^[97] Blackout sold over 3.1 million copies worldwide.^[98] Peter Robinson of The Observer said that "Britney has delivered the best album of her career, raising the bar for modern pop music with an incendiary mix of Timbaland's Shock Value and her own back catalogue."^[99] Dennis Lim of Blender commented, "Spears’s fifth studio album is her most consistent, a seamlessly entertaining collection of bright, brash electropop."^[100] Blackout won Album of the Year at MTV Europe Music Awards 2008 and was listed as the fifth Best Pop Album of the Decade by The Times.^[101][102] Spears performed the lead single "Gimme More" at the 2007 MTV Video Music Awards. The performance was panned by many critics. David Willis of BBC stated her performance would "go down in the history books as being one of the worst to grace the MTV Awards".^[103] Despite the backlash, the single rocketed to worldwide success, peaking at number one in Canada and the top ten in almost every country it charted.^[104][105] The second single "Piece of Me" reached the top of the charts in Ireland and reached the top five in Australia, Canada, Denmark, New Zealand and the United Kingdom. The third single "Break the Ice" was released the following year and had moderate success due to Spears not being able to promote it properly.^{[106][107][108]} In December 2007, Spears began a relationship with paparazzo Adnan Ghalib.^[109]

[edit] 2008–10: Conservatorship, and Circus

Spears performing "Freakshow" at The Circus Starring Britney Spears, 2009.

On January 3, 2008, Spears refused to relinquish custody of her sons to Federline's representatives. She was hospitalized at Cedars-Sinai Medical Center, after police that arrived at her house noted she appeared to be under the influence of an illicit substance. The following day, Spears's visitation rights were suspended at an emergency court hearing, and Federline was given sole physical and legal custody of the children. On January 31, 2008, Spears was committed to the psychiatric ward of Ronald Reagan UCLA Medical Center and put on 5150 involuntary psychiatric hold. The court placed her under temporary conservatorship of her father James Spears and attorney Andrew Wallet, giving them complete control of her assets.^[21] Spears was released on February 6, 2008. Her parents expressed disappointment and concern at the decision to release her.^[110] The following month, she guest-starred on the How I Met Your Mother episode "Ten Sessions" as receptionist Abby. She received positive reviews for her performance, as well as bringing the series its highest ratings ever.^[111][112] In July 2008, Spears regained some visitation rights after coming to an agreement with Federline and his counsel.^[113] On September 7, 2008, Spears opened the MTV Video Music Awards with a pre-taped comedy sketch with Jonah Hill and an introduction speech. She won Best Female Video, Best Pop Video and Video of the Year for "Piece of Me".^[114] A 60-minute introspective documentary, Britney: For the Record, was produced to chronicle Spears' return to the recording industry. Directed by Phil Griffin, For the Record was entirely shot in Beverly Hills, Hollywood, and New York City during the third quarter of 2008.^[115] Main shooting began on September 5, 2008, two days before Spears' appearance at the MTV Video Music Awards. For the Record was broadcast on MTV on November 30, 2008 to 5.6 million viewers for the two airings on the premiere night. MTV reported that Spears' documentary garnered on average, the highest rating in its Sunday night timeslot, in the network's history.^[116]

Her sixth studio album Circus, was released in December 2008. It received positive reviews from critics; according to the music review aggregation of Metacritic, it garnered an average score of 64/100.^[117] Circus debuted at number one in Canada, Czech Republic and the United States, and inside the top in many European nations.^[105][118] In the United States, Spears became the youngest female artist to have five albums debut at number one, earning a place in the Guinness Book of World Records.^[119] She also became the only act in the Soundscan era to have four albums debut with 500,000 or more copies sold.^[118] Circus became one of the fastest-selling albums of the year,^[120] and has sold 4 million copies worldwide.^[121][122] Its lead single, "Womanizer", became her first number one in the Billboard Hot 100 since "...Baby One More Time" and topped the charts in countries such as Belgium, Canada, Denmark, Finland, France, Norway and Sweden.^[123][124] It was also nominated for a Grammy in the category of Best Dance Recording.^[125] In January 2009, Spears and her father James obtained a restraining order against her former manager Sam Lufti, ex-boyfriend Adnan Ghalib and attorney Jon Eardley—all of whom, court documents claim, had been conspiring to gain control of Spears's affairs. The restraining order forbids Lutfi and Ghalib from contacting Spears or coming within 250 yards of her, her property or family members.^[126] Spears embarked on The Circus Starring Britney Spears in March 2009. With a gross of U.S. $131.8 million, it became the fifth highest grossing tour of the year.^[127]