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.

Pharrell Williams (born April 5, 1973), commonly known simply as Pharrell, is an American rapper, singer, record producer, composer, and fashion designer. Williams and Chad Hugo make up the record production duo The Neptunes, producing hip hop and R&B music. He is also the lead vocalist and drummer of hip-hop band N.E.R.D, which he formed with Hugo and childhood friend Shay Haley. He released his first single "Frontin'" in 2003 and followed up with his first album In My Mind in 2006.

As part of The Neptunes, Williams has produced numerous hit singles for various musicians. The two have earned three Grammy Awards amongst ten nominations. He is also the co-founder of the clothing brands Billionaire Boys Club and Ice Cream Clothing. He is a member of the supergroup V.A. Playaz with Fam-Lay, Clipse, Skillz, Missy Elliott, and Timbaland & Magoo.

Pharrell Williams was born on April 5, 1973, in Virginia Beach, Virginia, the eldest of three sons of Carolyn, a teacher, and Pharaoh Williams, a handyman. He met Chad Hugo in a seventh-grade summer band camp where Williams played the keyboards and drums and Hugo played tenor saxophone. They were also both members of a marching band; Williams played the snare drum while Chad was student conductor. With Hugo, Williams attended Princess Anne High School where they played in the school band; there he got the name Skateboard P.

William Leonard Roberts II (born January 28, 1976), better known by his stage name Rick Ross (often stylized as RICK RO$$), is an American rapper. He derived his stage name from the drug trafficker "Freeway" Ricky Ross, to whom he has no connection. Ross founded the record label Maybach Music Group, on which he released his studio albums Deeper Than Rap and Teflon Don, Ross was also the first artist signed to Diddy's management company Ciroc Entertainment. In early 2012, MTV named Ross as the Hottest MC In The Game.

William Leonard Roberts II was born in Coahoma County, Mississippi. and raised in Carol City, Florida, near Miami. After graduating from Carol City Senior High School, he later attended the historically black college Albany State University on a football scholarship.

After being signed to Suave House Records, former label for rap duo 8Ball & MJG, he eventually signed a deal with Slip-n-Slide Records, which has been under the Def Jam umbrella since 2006. While signed to Slip-n-Slide, Ross toured with fellow rapper Trick Daddy and made guest performances on other Slip-n-Slide albums.