Largely divorced from the traditional blues and rock and roll influences of British and American rock music up to that time, the period contributed to the evolution of electronic music and ambient music as well as the birth of post-punk, alternative rock and new-age music. Key artists associated with the tag include Can, Amon Düül II, Ash Ra Tempel, Faust, Popol Vuh, Cluster, Harmonia, Tangerine Dream, Klaus Schulze, Neu!, and Kraftwerk.