Black Sabbath kicked loose rock that's still setting off avalanches of creativity across the musical landscape. Their phenomenal first four albums -- Black Sabbath, Paranoid, Master of Reality, and Vol. 4 -- remain the clearest articulations of heavy metal vocabulary to date. Bassist Geezer Butler, the man responsible for the lion's share of Sabbath's early hits, focused his lyrics on social ills, self-destructive behavior, fantasy and the occult, setting...  [+]