A genre descended from rock music, characterized by massive sound, highly amplified distortion, and overall loudness, often with extended guitar solos, and lyrics that involve violent or fantastic imagery.
The origin of the music genre sense is often disputed; it was used by William S. Burroughs in Soft Machine and Nova Express and various music critics claim to have coined it: Sandy Pearlman,{{cite-magazine
|work=Crawdaddy
|author=Sandy Pearlman
|authorlink=Sandy Pearlman
|title=Review of the Byrds song “Artificial Energy”
|year=1968
Lester Bangs and Mike Saunders.{{cite-magazine
|author=Mike Saunders
|authorlink=Mike Saunders
|work=Rolling Stone
|title=Review of Humble Pie's As Safe As Yesterday Is