Herbert Jeffrey "Herbie" Hancock (born April 12, 1940) is an American pianist, keyboardist, bandleader, composer and actor. Starting his career with Donald Byrd, he shortly thereafter joined the Miles Davis Quintet where Hancock helped to redefine the role of a jazz rhythm section and was one of the primary architects of the post-bop sound. He was one of the first jazz musicians to embrace synthesizers and funk music. Hancock's music is often melodic and accessible; he has had many songs "cross over" and achieved success among pop audiences.