Fusion

Jazz fusion, fusion, or jazz rock is a musical genre that developed in the late 1960s from mixing funk and rhythm and blues rhythms with the electric instruments, amplified sound, electronic effects and playing styles of rock music together with jazz's complex time signatures (which were derived from non-Western music) and jazz's complex chord progressions and altered and extended chords. Fusion musicians typically create extended instrumental compositions based around a melody and a chord progression and lengthy solo improvisations. Fusion songs use brass instruments such as trumpet and saxophone as melody and soloing instruments. The rhythm section typically consists of electric bass (in some cases fretless), electric guitar, electric piano/synthesizer (in contrast to the double bass and piano used in earlier jazz) and drums. As with jazz forms that preceded fusion, all of the instruments–including the rhythm section instruments–are used as soloing instruments and all demonstrate a high level of instrumental technique.

The term "jazz-rock" is often used as a synonym for "jazz fusion" as well as for music performed by late 1960s and 1970s-era rock bands that added jazz elements to their music. It is different from the UK Canterbury Scene's progressive rock ("prog") and other forms of prog-jazz fusion, in which extended prog instrumentals use improvisation and take on a jazz-influenced feel. After a decade of popularity during the 1970s, fusion expanded its improvisatory and experimental approaches through the 1980s, in parallel with the development of a radio-friendly style called smooth jazz. Experimentation continued in the 1990s and 2000s. Fusion albums, even those that are made by the same group or artist, may include a variety of musical styles. Rather than being a codified musical style, fusion can be viewed as a musical tradition or approach.