Late Syd Barrett of Pink Floyd was into LSD when his career went off the tracks. Such a shame, he was amazingly good.

Another British band, Porcupine Tree, explored LSD in their early works, from "Lynton Samuel Dawson" to the amazing "Voyage 34", which includes the following remark:

  *They're not drug addicts
  Wandering around, not knowing where they are
  They're your most creative, most courageous
  And like it or not, they're going to build you
  A new civilization...*