King Crimson is an English rock band formed in London in 1968. The band has undergone numerous formations throughout its history of which 21 musicians have been members; since 2016 it has consisted of Robert Fripp, Jakko Jakszyk, Tony Levin, Mel Collins, Pat Mastelotto, Gavin Harrison and Jeremy Stacey.
Fripp is the only consistent member of the group, and is considered the leader and motive force. The band has earned a large cult following.
Developed from the unsuccessful trio Giles, Giles and Fripp, the band was seminal in the progressive rock genre in its first five years with its standard of instrumentation and complex song structures. King Crimson’s debut album, In the Court of the Crimson King (1969), remains its most successful and influential, with its elements of jazz, classical, and experimental music.