acid rock noun a genre of rock music US,1966 Folk etymology claims the music to be inspired by the altered states of conciousness induced by ACID
[A] new sort of music showed us “Strawberry Fields forever”–it was nicknamed acid rock [...] instantly internationalised with the release of The Beatles’ “Sergeant Pepper”. Acid rock was flower power’s jingle. — Richard Neville, PlayPower, p. 99, 1970