A good cover for my is when the band adds it stlye to it. Yes its a cover, but you can still tell what band is doing it. I went to a LIVE concert bout 2 months back and they did some excellent covers. They were emotional because of Sept 11 and Geogre Harrison's death. But you could still tell it was them. I like it when Pearl Jam do covers and i heard Incubus are evry clever as well.

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...there's no dark side of the moon really,...matter of fact its all dark....