Perhaps we can call them Avant-Prog Metal, or Grindcore Funk Theater, or in the words of one particularly rapt concertgoer “Satanic Anarchic Viking Shit."

Regardless, Sleepytime Gorilla Museum indoctrinates their audiences with circuitous melodies, unnamable harmonies and gleefully dark, evocative sounds emanating from an array of voices and instruments, many of them homemade.