- Happy Birthday to You(uncredited)Written by Patty S. Hill & Mildred J. Hill[The wait staff at the restaurant sing the song for a boy customer's birthday]
- History of Everything(uncredited)Written by Barenaked LadiesPerformed by Barenaked Ladies[Series theme song played during the opening titles]
- True Colors(uncredited)Written by Tom Kelly and Billy SteinbergPerformed by Kunal Nayyar[Raj sings the song at Leonard's birthday party]
- 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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