- History of Everything(uncredited)Written by Barenaked LadiesPerformed by Barenaked Ladies[Series theme song played during the opening titles]
- Sweet Georgia Brown(uncredited)[Leonard, Howard and Raj whistle the tune while they're eating their Chinese food dinner with Penny]
- History of Everything (Instrumental version)(uncredited)Written by Barenaked LadiesPerformed by Barenaked Ladies[Instrumental version of series theme song played over the closing credits]
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