Bitches Brew is a studio double album by Miles Davis, released on March 30, 1970, on Columbia Records. The album continued his experimentation with electric instruments previously featured on his critically acclaimed In a Silent Way album. With the use of these instruments, such as the electric piano and guitar, Davis rejected traditional jazz rhythms in favor of a looser, rock-influenced improvisational style. Upon release, it received a mixed response, due to the album's unconventional style and experimental sound. Later, Bitches Brew gained recognition as one of jazz's greatest albums and a progenitor of the jazz rock genre, as well as a major influence on rock and funk musicians. The album won a Grammy Award for Best Large Jazz Ensemble Album in 1971.