Stephen Paul Motian (March 25, 1931 – November 22, 2011) was an American jazz drummer, percussionist, and composer. Motian played an important role in freeing jazz drummers from strict time-keeping duties. 　　He first came to prominence in the late 1950s in the piano trio of Bill Evans, and later was a regular in pianist Keith Jarrett's band for about a decade (c. 1967–1976). Motian began his career as a bandleader in the early 1970s. Perhaps his two most notable groups were a longstanding trio of guitarist Bill Frisell and saxophonist Joe Lovano, and the Electric Bebop Band which featured the drummer working mostly with younger musicians doing interpretations of bebop standards.