How about Meat Loaf and Ronnie James Dio? I think that their voices would make a good contrast, yet have enough in common that it wouldn't sound too strange. As for the song, I think that it would be best for it to be a new one, but if they were to redo an old one, something like "Rock and Roll Mercenaries", "Life Is A Lemon" or Dio's "Rock and Roll Children" might work quite well.
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