- History of Everything(uncredited)Written by Barenaked LadiesPerformed by Barenaked Ladies[Series theme song played during the opening titles]
- Smooth Operator
- Work Bitch(uncredited)Written by Will.i.am, Otto Jettman, Sebastian Ingrosso, Anthony Preston, Ruth Anne Cunningham and Britney SpearsPerformed by Britney Spears[The song Howard plays to drown out Stuart's noise]
- Batman Theme(uncredited)Written by Neal Hefti[Played when Leonard and Penny drive off]
- 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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