A fusion genre is a music genre which combines two or more other genres. For example, rock and roll originally developed as a fusion of blues, gospel and country music. Some other examples are jazz fusion, jazz-funk, blues-rock, nu metal, and rhythm and blues. The main characteristics of Fusion are variations in tempo, rhythm and sometimes the use of long musical "journeys" that can be divided into smaller parts, each with their own dynamics,style and tempo. Rock and roll (also spelled Rock n Roll, especially in its first decade), also called rock, is a form of popular music, usually featuring vocals (often with vocal harmony), electric guitars and a strong back beat; other instruments, such as the saxophone, are common in some styles. ... The blues is a vocal and instrumental form of music based on a pentatonic scale and a characteristic twelve-bar chord progression. ... For the genre of Christian-themed music, see gospel music. ... country music, see Country music (disambiguation) In popular music, country music, also called country and western music or country-western, is an amalgam of popular musical forms developed in the Southern United States, with roots in traditional folk music, Celtic Music, Blues, Gospel music, and Old-time music that began... Bitches Brew (1970) by Miles Davis is considered the most influential early fusion album Jazz fusion (sometimes referred to simply as fusion) is a musical genre that loosely encompasses the merging of jazz with other styles, particularly rock, funk, R&B, and world music. ... Jazz-funk was the British name for a musical genre used to denote a style of mostly American disco-ish jazz music, popular on the club-circuit of England in the mid 1970s. ... Blues Rock or Blues-rock is a fusion genre of music which combines elements of the blues with rock and roll. ... Nu metal (or aggro metal) is a subgenre of heavy metal music. ... Rhythm and blues (or R&B or even Runub) was coined as a musical marketing term introduced in the United States in the late 1940s by Jerry Wexler at Billboard magazine, used to designate upbeat popular music performed by African American artists that combined jazz and blues. ...