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Katherine Maria Jenkins (born 29 June 1980) is a Welsh mezzo-soprano. Jenkins performs operatic arias, popular songs, musical theatre and hymns.

Kathleen Alice Mattea (born June 21, 1959) is an American country music and bluegrass singer. Active since 1984 as a recording artist, she has charted more than 30 singles on the Billboard Hot Country Songs charts.

Ketevan "Katie" Melua (born 16 September 1984) is a Georgian-British singer and songwriter.

Kathleen Anne Brien (born 8 May 1989), better known as Katy B, is an English singer and songwriter.

Katheryn Elizabeth Hudson (born October 25, 1984), known by her stage name Katy Perry, is an American singer, songwriter and television judge. After singing in church during her childhood, she pursued a career in gospel music as a teenager.

Katzenjammer was an English-language Norwegian band from Oslo, formed in 2005. The band consists of Anne Marit Bergheim, Solveig Heilo and Turid Jørgensen. Former band member Marianne Sveen left the band in the beginning of 2016.

Keane are an English rock band from Battle, East Sussex, formed in 1995. The band currently comprises Tom Chaplin (lead vocals, electric/acoustic guitar), Tim Rice-Oxley (piano, synthesisers, bass guitar, backing vocals), Richard Hughes (drums, percussion, backing vocals), and Jesse Quin (bass guitar, acoustic/electric guitar, backing vocals).

Kevin Roosevelt Moore (born October 3, 1951), known as Keb' Mo', is an American blues musician and five-time Grammy Award winner. He is a singer, guitarist, and songwriter, living in Nashville, Tennessee. He has been described as "a living link to the seminal Delta blues that travelled up the Mississippi River and across the expanse of America".

Kehlani Ashley Parrish (born April 24, 1995) is an American singer, songwriter, and dancer. Kehlani is originally from Oakland, California, where she achieved initial fame as a member of the teen group Poplyfe.

Keith Anderson (born January 12, 1968) is an American country music artist.

Keith Douglas Sweat (born July 22, 1961) is an American singer, songwriter, and an early figure in the new jack swing musical movement.

Keith Lionel Urban (born 26 October 1967) is a New Zealander-Australian singer, songwriter and record producer well known for his work in country music.