Comic-Con

Hot Video: Big Bang Cast (and Chuck Lorre!) Jam with Barenaked Ladies on Theme Song

Bang!

In a new video touting the Sept. 18 syndicated launch of TV’s most-watched comedy, The Big Bang Theory, the cast of the CBS hit — and even series boss Chuck Lorre, on guitar — jam with Barenaked Ladies as they perform the show’s very, very catchy theme song, right there on the sitcom’s set.

The music video’s premiere comes almost a year after Barenaked Ladies surprised the 2010 San Diego Comic-Con crowd by dropping by the Big Bang Theory panel to perform the ditty, in a live sing-along (seen here). This new, sure-to-be-viral vid also comes on the eve of Barenaked Ladies kicking off a 15-city concert tour, starting Saturday in Chicago, Ill.

Four days after its launch into syndication, The Big Bang Theory bows its new season on CBS, on Thursday, Sept. 22, at 8/7c.