GarageBand is a software application for Mac OS X and iOS that allows users to create music or podcasts. It is developed by Apple Inc. as a part of the iLife software package on Mac OS X.

GarageBand is a streamlined digital audio workstation (DAW) and music sequencer that can record and play back multiple tracks of audio. Built-in audio filters that utilize the AU (audio unit) standard allow the user to enhance the audio track with various effects, including reverb, echo, and distortion amongst others. GarageBand also offers the ability to record at both 16-bit and 24-bit Audio Resolution An included tuning system helps with pitch correction and can effectively imitate the auto-tune effect when tuned to the maximum level.

GarageBand includes a large selection of realistic, sampled instruments and software modeled synthesizers. These can be used to create original compositions or play music live through the use of a USB MIDI keyboard connected to the computer, an on-screen virtual keyboard, or using a standard QWERTY keyboard with the "musical typing" feature. The synthesizers are broken into 2 groups: [virtual] analog and digital. Each synthesizer has a wide variety of adjustable parameters, including richness, glide, cut off, standard attack, decay, sustain, and release; these allow for a wide array of sounds to be created.

Katheryn Elizabeth Hudson (born October 25, 1984), known by her stage name Katy Perry, is an American singer, songwriter and actress. Perry grew up with gospel music, and during her first year of high school she pursued a music career as Katy Hudson, releasing her first studio album called Katy Hudson which failed to chart. She recorded a solo album later, which was never released. After signing with Capitol Music Group in 2007, her fourth record label in seven years, she adopted the stage name Katy Perry.

She first gained recognition with the release of her first mainstream album, One of the Boys in 2008, which spawned three Billboard Hot 100 top-ten songs—"I Kissed A Girl", "Hot n Cold" and "Waking Up In Vegas". Perry supported the album with her Hello Katy Tour. In 2010, her third studio album, Teenage Dream (2010), which topped the Billboard 200 chart, and spawned five number one singles—"California Gurls", "Teenage Dream", "Firework", "E.T." and "Last Friday Night (T.G.I.F.)"—Teenage Dream was the only album (after Michael Jackson's Bad)—to do so, and the first female in history to achieve this milestone. She embarked on the California Dreams Tour, which grossed nearly $60 million worldwide. Perry re-released the album under the name of Teenage Dream: The Complete Confection on March 26, 2012, and the re-release has already spawned the number-one single "Part of Me".

Faheem Rasheed Najm (born September 30, 1985), who goes by his stage name T-Pain, is an American singer-songwriter, rapper, record producer, and actor. His debut album, Rappa Ternt Sanga, was released in 2005. In 2007, T-Pain released his second studio album Epiphany, which reached number one on the Billboard 200. His third studio album,Thr33 Ringz, was released in 2008. T-Pain has earned two Grammy Awards alongside artists Kanye West and Jamie Foxx.

T-Pain is the founder of the record label Nappy Boy Entertainment, established in 2005. Throughout his career as a singer, T-Pain has extensively used the Auto-Tune pitch correction effect.

Najm was born in Tallahassee, Florida on September 30, 1985. His stage name is short for "Tallahassee Pain" and was chosen because of the hardships he experienced while living there. He is a Muslim. At just three years old he got his first taste of the music business. A friend of the family, gospel jazz artist/producer Ben Tankard allowed him to hang out and "twist the knobs" at his recording studio. At age ten, Najm turned his bedroom into a music studio, using a keyboard, a beat machine and a four-track recorder.

Kanye Omari West ( /ˈkɑːnjeɪ/; born June 8, 1977) is an American musician, film director and fashion designer. West first rose to fame as a producer for Roc-A-Fella Records, where he eventually achieved recognition for his work on Jay-Z's album The Blueprint, as well as hit singles for musical artists including Alicia Keys, Ludacris, and Janet Jackson. His style of production originally used pitched-up vocal samples from soul songs incorporated with his own drums and instruments. However, subsequent productions saw him broadening his musical palette and expressing influences encompassing '70s R&B, baroque pop, trip hop, arena rock, folk, alternative, electronica, synthpop, and classical music.

West released his debut album The College Dropout in 2004, his second album Late Registration in 2005, his third album Graduation in 2007, his fourth album 808s & Heartbreak in 2008, and his fifth album My Beautiful Dark Twisted Fantasy in 2010. West released a collaborative album, Watch the Throne with Jay-Z in 2011, which is the duo's first collaborative album. His five solo albums, all of which have gone platinum, have received numerous awards and critical acclaim. As of 2012, West has won a total of eighteen Grammy Awards, making him one of the most awarded artists of all-time. All albums have been very commercially successful, with My Beautiful Dark Twisted Fantasy becoming his fourth consecutive No. 1 album in the U.S. upon release. West has had 5 songs exceed 3 million in digital sales as of July 2011, with "Gold Digger" selling 3,086,000, "Stronger" selling 4,402,000, "Heartless" selling 3,742,000, "E.T." selling over 4,000,000 and "Love Lockdown" selling over 3,000,000 placing him third in overall digital sales of the past decade. He has sold over 30 million digital songs in the United States making him one of the best-selling digital artists of all-time.