True Black Death Metal From 1977

Richard Pryor from 1977.

Pre-Spinal Tap Mystical Hobbit Rockers? Check.
Druidic cloaks? Check.
Smoke machines? Check.
Pryor throwing giant bags of drugs and pills into his all-white teenage audience? Check.
Pryor using a gas gun to kill the first few rows? Check.

And finally, Richard Pryor taking a machine gun to his fans, killing every white teenager in the place? Double-check.