- History of Everything(uncredited)Written by Barenaked LadiesPerformed by Barenaked Ladies[Series theme song played during the opening titles]
- Eye of the Tiger(uncredited)Written by Jim Peterik and Frankie SullivanPerformed by Survivor[Instrumental sections of the song are played after Raj tells Sheldon they should buckle down and work, then again when Sheldon and Raj leave Raj's apartment]
- 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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