VIDEO: 'Big Bang' Theme Song Filmed On Show's Set With Cast And Chuck Lorre

The music video, shot to promote the syndication launch of The Big Bang Theory this fall, features rock band Barenaked Ladies on the set of the hit CBS comedy series performing the theme song from the show in front of the cast and crew. Taking a turn on the guitar is Big Bang co-creator Chuck Lorre, who is a guitarist and songwriter himself.