The voice you hear at the beginning of the "Big Bang Theory" theme song, alternately titled "History of Everything," belongs to Ed Robertson, the lead singer of Canadian rock band Barenaked Ladies. The band, which was formed in 1988 in Toronto, was originally a duo, consisting just of Robertson and fellow singer and guitarist Steven Page. The current lineup includes Jim Creeggan, Kevin Hearn, Robertson, and Tyler Stewart, with Page having left the band in 2009.

The invitation to come up with a theme song for "The Big Bang Theory" came from the show's creators themselves: Bill Prady and Chuck Lorre. However, Robertson was so doubtful that Barenaked Ladies would get the gig that he ended up writing it in the shower 20 minutes before the conference call he was due to present it at. It was a stroke of genius that led to "History of Everything" becoming one of the band's most recognizable songs and a staple of their ample, hit-filled discography.

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