Jazz Fusion

Jazz fusion (also known as jazz rock, jazz-rock fusion, or simply fusion[2]) is a popular music genre that developed in the late 1960s when musicians combined jazz harmony and improvisation with rock music, funk, and rhythm and blues. Electric guitars and basses, amplifiers, and keyboard instruments (including electric pianos and organs) that were popular in rock began to be used by jazz musicians, particularly those who had grown up listening to rock and roll. Jazz fusion arrangements vary in complexity. Some employ groove-based vamps fixed to a single key or a single chord with a simple, repeated melody. Others use elaborate chord progressions, unconventional time signatures, or melodies with counter-melodies, in a similar fashion to progressive rock. https://en.wikipedia.org/wiki/Jazz_fusion

• AllMusic states that "until around 1967, the worlds of jazz and rock were nearly completely separate",[5] although the Daevid Allen Trio which later became the Soft Machine formed in 1963,[6] while the jazz label Verve released the influential debut album, Freak Out!, by artist and composer Frank Zappa in 1966.[7]
• Guitarist Larry Coryell, sometimes called the godfather of fusion, referred to a generation of musicians who had grown up on rock and roll when he said, "We loved Miles but we also loved the Rolling Stones."[7] In 1966, he started the band the Free Spirits with Bob Moses on drums and recorded the band's first album,[4] Out of Sight and Sound, released in 1967. That same year, DownBeat began to report on rock music.[7]
• According to music journalist Zaid Mudhaffer, the term "jazz fusion" was coined in a review of Song of Innocence by David Axelrod when it was released in 1968.[8] Axelrod said Miles Davis had played the album before conceiving Bitches Brew.