WordNet (r) 3.0 (2006):

acid rock
    n 1: a musical style that emerged in the 1960s; rock music
         inspired by or related to drug-induced experience [syn:
         psychedelic rock, acid rock]

Moby Thesaurus II by Grady Ward, 1.0:

26 Moby Thesaurus words for "acid rock":
   avant-garde jazz, ballroom music, bebop, boogie-woogie, bop,
   country rock, dance music, dances, folk rock, hard rock, hot jazz,
   jazz, jive, mainstream jazz, musical suite, rag, ragtime,
   rhythm-and-blues, rock, rock-and-roll, suite, suite of dances,
   swing, syncopated music, syncopation, the new music