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.

Claude Russell Bridges (born April 2, 1942), known professionally as Leon Russell, is an American musician and songwriter, who has recorded as a session musician, sideman, and maintained a solo career in music.

Born in Lawton, Oklahoma, he began playing piano at the age of four. Russell attended Will Rogers High School in Tulsa, Oklahoma. At this time he was already performing at Tulsa nightclubs. After moving to Los Angeles, he became a session musician, working as a pianist on the recordings of many notable musical artists since the 1960s. By the late 1960s, Russell diversified, becoming successful as an arranger and wrote/co-wrote songs. As a musician, he worked his way from gigs as a sideman to well known performers. By 1970 he had graduated to solo recording artist, although he never ended all his previous roles within the music industry.

Russell was inducted into the Rock & Roll Hall of Fame on Monday, March 14, 2011, at a black-tie dinner at The Waldorf-Astoria hotel in Manhattan.

Miles Dewey Davis III (May 26, 1926 – September 28, 1991) was an American jazz musician, trumpeter, bandleader, and composer. Widely considered one of the most influential musicians of the 20th century, Miles Davis was, with his musical groups, at the forefront of several major developments in jazz music, including bebop, cool jazz, hard bop, modal jazz, and jazz fusion.

Miles Dewey Davis was born on May 26, 1926, to an affluent African American family in Alton, Illinois. His father, Dr. Miles Henry Davis, was a dentist. In 1927 the family moved to East St. Louis, Illinois. They also owned a substantial ranch in northern Arkansas, where Davis learned to ride horses as a boy.

Davis' mother, Cleota Mae (Henry) Davis, wanted her son to learn the piano; she was a capable blues pianist but kept this fact hidden from her son. His musical studies began at 13, when his father gave him a trumpet and arranged lessons with local musician Elwood Buchanan. Davis later suggested that his father's instrument choice was made largely to irk his wife, who disliked the trumpet's sound. Against the fashion of the time, Buchanan stressed the importance of playing without vibrato; he was reported to have slapped Davis' knuckles every time he started using heavy vibrato. Davis would carry his clear signature tone throughout his career. He once remarked on its importance to him, saying, "I prefer a round sound with no attitude in it, like a round voice with not too much tremolo and not too much bass. Just right in the middle. If I can’t get that sound I can’t play anything."Clark Terry was another important early influence.^{[citation needed]}

Carlene Carter (born Rebecca Carlene Smith; September 26, 1955) is an American country singer and songwriter. She is the daughter of June Carter and her first husband, Carl Smith.

Between 1978 and the present, Carter has recorded twelve albums, primarily on major labels. In the same timespan, she has released more than twenty singles, including three #3-peaking hits on the Billboard Hot Country Songs charts.

In 1987, Carlene Carter joined with the singing trio The Carter Sisters, consisting of her mother June Carter Cash and June's sisters Helen and Anita Carter in a revived version of The Carter Family, and were featured on a 1987 television episode of Austin City Limits along with Carlene's stepfather Johnny Cash.

Her solo recording career had begun in the late 1970s with her eponymous debut album. In 1979, during a concert at New York's Bottom Line, she introduced a song about mate-swapping called Swap-Meat Rag, from her album Two Sides to Every Woman, by stating, "If this song don't put the cunt back in country, I don't know what will." Johnny Cash and June Carter were in the audience, unknown to Carlene. The comment was quoted widely in the press, and Carter spent much of the next decade trying to live it down.

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".