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The contestants on The Sing-Off may sing a cappella, but damn if they don't have a rock 'n' roll attitude. Just check out the University of Oregon group On the Rocks and you'll see the crazy, rowdy group of guys that their leader Joshua is forced to deal with.

Oh man, it's like being backstage at a Zeppelin show in the '70s...if Zeppelin had had their testicles cut off and were frightened of boobies.