Do you know your music?

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Across
  1. 3. This band played concerts louder than the big bang (really)
  2. 4. The band that first invented the term "Heavy Metal"
  3. 5. Ozzy Osbourne bit off the head of that animal once
Down
  1. 1. Called a "death metal band" by Bart from the Simpsons, promptly calling an outrage by fans
  2. 2. Graham Chapman of Monthy Python appeared in a video of this band once