AllMusic (previously All Music Guide or AMG; stylized as allmusic) is an online music guide service, owned by All Media Guide. AllMusic was founded in 1991 by popular culture archivist Michael Erlewine as a guide for consumers. Its first reference book was published the following year. When first released onto the Internet, AMG predated the World Wide Web and was first available as a Gopher site.

AMG headquarters is located in Ann Arbor, Michigan, United States.

AllMusic's database, which is licensed and used in point-of-sale systems by some music retailers, includes:

AllMusic also claims to have the largest digital archive of music, including about six million digital songs, as well as the largest cover art library, with more than half a million cover image scans.

The AllMusic database is also used by several generations of Windows Media Player and Musicmatch Jukebox to identify and organize music collections. Windows Media Player 11 and the integrated MTV Urge music store have expanded the use of AllMusic data to include related artists, biographies, reviews, playlists and other data.

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".

Khaled Bin Abdul Khaled (born November 26, 1975), better known by his stage name DJ Khaled, is an American record producer, radio personality, DJ, rapper & record label executive. He is a radio host for the Miami-based urban music radio station WEDR and the DJ for the hip hop group Terror Squad. In 2006, Khaled released his debut album Listennn... the Album. He went on to release We the Best (2007), We Global (2008), Victory (2010), and We the Best Forever (2011). In 2009, Khaled became the president of record label Def Jam South.

Khaled was born in New Orleans, Louisiana. He is of Palestinian descent and lives in Sunny Isles, Florida. Currently, he hosts the weeknight program TakeOver on Miami-based urban music radio station WEDR with fellow host K. Foxx; Khaled states that he has worked for the station professionally since 2003. Early in his career he dj'd for a south Florida regional station Power 96.5 FM. In 1998, Khaled worked as a "sidekick" for Miami rapper Luther Campbell for Campbell's Friday night WEDR radio show The Luke Show. In his albums, Khaled usually provides "shoutouts" that assert his representation of "the ghetto" and urges people to listen. From 2004 to 2006, Khaled assisted in the production of the hip-hop albums Real Talk by Fabolous, True Story by Terror Squad, All or Nothing by Fat Joe, and Me, Myself, & I by Fat Joe. Many of DJ Khaled's songs are known to entice the listener by hip hop chanting his name before the song starts. Khaled represents the Kendall area of Miami. He is Muslim. He is currently engaged to Nicole Tuck.