Canadian rockers the Barenaked Ladies have filmed a music video for “The History of Everything,” their theme song for CBS’ hit sitcom “The Big Bang Theory.”

Posted after the break, the video features the band sneaking onto the set of the show and performing an expanded version of the bouncy theme for the cast and crew. They even sit in Sheldon’s spot on the couch!

In an interview last fall, BNL frontman Ed Robertson shared with me the story of how show creators Chuck Lorre and Bill Prady approached him to pen the theme:

“They said, ‘Well, you’re the only one we’ve asked. We really want you to do this.’ And I said, ‘Well, that’s great because I can give you what you’re looking for if you can tell me what you want,’” he said. “So it was a great relationship right from the start.”

The extended version of “The History of Everything” has now become a popular part of BNL’s live shows.

“We played it one night just kind of on a lark, and people went nuts. It’s one of the hits in the set now,” he said with a laugh.