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Kevin Brereton (born February 20, 1972), better known by his stage name k-os (pronounced /ˈkeɪ.ɒs/ "chaos"), is a Canadian rapper, singer, songwriter and record producer. His given name may also be cited as Kheaven, a spelling he later adopted.

The alias "k-os" (spelled with a lower case "k") is an acronym for "Knowledge of Self," although in a later interview he also said that it used to stand for "Kheaven's Original Sound." His music incorporates a wide variety of music genres including rap, funk, rock, and reggae. The lyrics frequently focus on promoting a "positive message" while at times expressing criticism of mainstream hip hop culture's obsession with money, fame and glorification of violence. A musician as well as a producer, k-os has written and produced nearly every part of all four of his albums. k-os usually performs with a live band, something that is uncommon in the hip hop genre. He sometimes plays guitar and keyboard both during live performances and in the studio.

k-os received his first musical exposure with the single "Musical Essence", released in 1993. After the release of his second single "Rise Like The Sun" in 1996 he withdrew from the industry because he was dissatisfied with his musical style. He reappeared briefly in 1999 and released his debut album Exit in 2002. The album received positive reviews but sold relatively few copies. He released his second album Joyful Rebellion in 2004, which received platinum status in Canada. Joyful Rebellion received positive reviews, and Atlantis: Hymns for Disco, was released in 2006. His most recent album, Yes!, was released in 2009.