Jazz Fusion/Jazz-Rock

Jazz fusion, fusion, or jazz-rock are variants of a musical fusion genre that developed from mixing funk and R&B rhythms and the amplification and electronic effects of rock music, complex time signatures derived from non-Western music and extended, typically instrumental compositions with a jazz approach to lengthy group improvisations, often using wind and brass and displaying a high level of instrumental technique. After a decade of popularity during the 1970s, fusion expanded its improvisatory and experimental approaches through the 1980s and 1990s. Fusion albums, even those that are made by the same group or artist, may include a variety of styles. Rather than being a codified musical style, fusion can be viewed as a musical tradition or approach.

Source: http://en.wikipedia.org/wiki/Jazz-Rock