cerberus shoal and alvarius b did it. Didn't the oxes do it with somebody? Converge and American Nightmare did it, I think -- it was some weird combo like that, they didn't "cover" each other; they wrote a song for each other to play. Ah, who else.. related but not exactly the same is the Sun City Girls/Thinking Fellers Union Local # 282 split where they both got together and covered Caroliner songs.
As for bands I'd like to see do it.. I'd like to see Captain Beefheart covering Guns N Roses and vice-versa.
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