- History of Everything(uncredited)Written by Barenaked LadiesPerformed by Barenaked Ladies[Series theme song played during the opening titles]
- Good King Wenceslas(uncredited)Traditional tune, lyrics by John M. Neale and Thomas HelmorePerformed by Jim Parsons[Sheldon sings the carol when the guys are playing D&D]
- Let's Do It Again(uncredited)Written by Renald FrancoeurPerformed by Renald Francoeur[Played in background of bar when Raj gets Jennifer's fake email address]
- Jingle Bells(uncredited)Written by James Pierpont[Stuart, Howard and Sheldon play the song on the bells]
- 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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