Here is a strange cover. Last night on Letterman, The Foo Fighters and the Zac Brown Band rocked out a cover of Black Sabbath's "War Pigs."

I thought it was pretty bad ass and worth the share. The only thing that sucks about this video is it doesn't show Paul Shaffer acting like he's rocking out with the band. He always looks like he's killing it but you hardly ever hear the keyboards. Paul co-wrote "It's Raining Men" by The Weather Girls.

That fact always cracks me up.
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