Rock and roll (often written as rock & roll or rock 'n' roll) is a genre of popular music that originated and evolved in the United States during the late 1940s and early 1950s,[1][2] primarily from a combination of the blues, country music, jazz [3] and gospel music.[4] Though elements of rock and roll can be heard in country records of the 1930s,[3] and in blues records from the 1920s,[5] rock and roll did not acquire its name until the 1950s.[6][7] An early form of rock and roll was rockabilly,[8] which combined country and jazz with influences from traditional Appalachian folk music and gospel.[9]