Earth

Earth /ˈɜːrθ/ (also the world, in Greek: Γαῖα Gaia, or in Latin: Terra) is the third planet from the Sun, the densest planet in the Solar System, the largest of the Solar System's four terrestrial planets, and the only astronomical object known to harbor life.

According to evidence from radiometric dating and other sources, Earth was formed about 4.54 billion years ago. Earth gravitationally interacts with other objects in space, especially the Sun and the Moon. During one orbit around the Sun, Earth rotates about its own axis 366.26 times, creating 365.26 solar days or one sidereal year. Earth's axis of rotation is tilted 23.4° away from the perpendicular of its orbital plane, producing seasonal variations on the planet's surface with a period of one tropical year (365.24 solar days). The Moon is Earth's only permanent natural satellite. Its gravitational interaction with Earth causes ocean tides, stabilizes the orientation of Earth's rotational axis, and gradually slows Earth's rotational rate.

Electro (music)

Electro (short for either electro-funk, or electro-boogie) is a genre of electronic music and early hip hop directly influenced by the use of TR-808 drum machines, and funk. Records in the genre typically feature drum machines and heavy electronic sounds, usually without vocals, although if vocals are present they are delivered in a deadpan manner, often through electronic distortion such as vocoding and talkboxing. This is the main distinction between electro and previously prominent genres such as disco, in which the electronic sound was only part of the instrumentation. It also palpably deviates from its predecessor boogie for being less vocal-oriented and more focused on electronic beats produced by drum machines.

Following the decline of disco music in the United States, electro emerged as a fusion of funk and New York boogie. Early hip hop and rap combined with German and Japanese electropop influences such as Kraftwerk and Yellow Magic Orchestra (YMO) inspired the birth of electro. In 1982, producer Arthur Baker with Afrika Bambaataa released the seminal "Planet Rock" which was influenced by the Yellow Magic Orchestra using samples Kraftwerk and drum beats supplied by the TR-808. Planet Rock was followed later that year by another breakthrough electro record, Nunk by Warp 9. In 1983, Hashim created an electro funk sound which influenced Herbie Hancock, resulting in his hit single "Rockit". The early 1980s were electro's mainstream peak. By the mid 1980s, the genre moved away from its electronic and funk influences, using harder edged beats and rock samples, exemplified by Run DMC. Electro became popular again in the late 1990s with artists such as Anthony Rother and DJs such as Dave Clarke. A third wave of popularity occurred in 2007. Electro has branched out into subgenres, including "electrocore" and Skweee, which developed in Sweden and Finland.

Digital distribution

Digital distribution (also called content delivery, online distribution, or electronic software distribution (ESD), among others) is the delivery or distribution of media content such as audio, video, software and video games. The term is generally used to describe distribution over an online delivery medium, such as the Internet, thus bypassing physical distribution methods, such as paper, compact discs, and DVDs. The term online distribution is typically applied to freestanding products; downloadable add-ons for other products are more commonly known as downloadable content. With the advancement of network bandwidth capabilities, online distribution became prominent in the 2000s.

Content distributed online may be streamed or downloaded, and often consists of books, films and television programs, music, software, and video games. Streaming involves downloading and using content at a user's request, or "on-demand", rather than allowing a user to store it permanently. By contrast, fully downloading content to a hard drive or other form of storage media may allow offline access in the future.

Imperative mood

The imperative is a grammatical mood that forms commands or requests, including the giving of prohibition or permission, or any other kind of advice or exhortation.

An example of a verb in the imperative mood is be in the English sentence "Please be quiet". Imperatives of this type imply a second-person subject (you); some languages also have first- and third-person imperatives, with the meaning of "let's (do something)" or "let him/her/them (do something)" (these forms may alternatively be called cohortative and jussive).

Imperative mood can be denoted by the glossing abbreviation IMP. It is one of the irrealis moods.

Formation

Imperative mood is often expressed using special conjugated verb forms. Like other finite verb forms, imperatives often inflect for person and number. Second-person imperatives (used for ordering or requesting performance directly from the person being addressed) are most common, but some languages also have imperative forms for the first and third persons (alternatively called cohortative and jussive respectively).

Electronic music

Electronic music is music that employs electronic musical instruments and electronic music technology in its production, an electronic musician being a musician who composes and/or performs such music. In general a distinction can be made between sound produced using electromechanical means and that produced using electronic technology. Examples of electromechanical sound producing devices include the telharmonium, Hammond organ, and the electric guitar. Purely electronic sound production can be achieved using devices such as the theremin, sound synthesizer, and computer.

The first electronic devices for performing music were developed at the end of the 19th century, and shortly afterward Italian Futurists explored sounds that had previously not been considered musical. During the 1920s and 1930s, electronic instruments were introduced and the first compositions for electronic instruments were composed. By the 1940s, magnetic audio tape allowed musicians to tape sounds and then modify them by changing the tape speed or direction, leading to the development of electroacoustic tape music in the 1940s, in Egypt and France. Musique concrète, created in Paris in 1948, was based on editing together recorded fragments of natural and industrial sounds. Music produced solely from electronic generators was first produced in Germany in 1953. Electronic music was also created in Japan and the United States beginning in the 1950s. An important new development was the advent of computers for the purpose of composing music. Algorithmic composition was first demonstrated in Australia in 1951.