Barenaked Ladies Film New Video With Cast of 'The Big Bang Theory'

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Canadian rockers the Barenaked Ladies have filmed a music video for the theme song of CBS's "The Big Bang Theory."
In the video, the band sneaks onto the set of the show and surprises the cast and crew with a performance of a longer version of the opening theme song.
Check out this video for an extended listen to the theme with behind the scenes footage.