Miles Davis incorporated similar elements as well as a more Rock oriented rhythm section with the album Bitches Brew.
In this era of jazz, the use of electric instruments and rebellion of what was considered jazz began to expand quickly. Artists such as Sun Ra, Miles Davis and Herbie Hancock began to make music that was meant to stretch and push the boundaries of what jazz was. In avant-garde jazz elements of classical music and the use of atonal and arrhythmic concepts were used to broaden the palette of what is considered acceptable. Miles Davis incorporated similar elements as well as a more Rock oriented rhythm section with the album Bitches Brew. At this point the use of electric guitar and bass or electric organ or piano became much more of a feature and with bands like Return to Forever and Headhunters, the use of synthesizers and other electronics. Notable composers and music to check out from this era are: