American rock

American rock has its roots from 1940s and 1950s rock and roll, rhythm and blues, and country music, and also draws from folk music, jazz, blues, and classical music. American rock music was further influenced by the British Invasion of the American pop charts from 1964 and resulted in the development of psychedelic rock. From the late 1960s and early 1970s, American rock music was highly influential in the development of a number of fusion genres, including blending with folk music to create folk rock, with blues to create blues rock, with country music to create country rock, roots rock and Southern rock and with jazz to create jazz rock, all of which contributed to psychedelic rock. In the 1970s, rock developed a large number of subgenres, such as soft rock, hard rock, heavy metal, glam rock, progressive rock and punk rock.