- History of Everything(uncredited)Written by Barenaked LadiesPerformed by Barenaked Ladies[Series theme song played during the opening titles]
- The Imperial March (Darth Vader's Theme)(uncredited)Composed by John WilliamsPerformed by Jim Parsons[Sheldon hums the tune when he exits the apartment]
- The Lion Sleeps Tonight(uncredited)Original written by Solomon LindaPerformed by James Earl Jones and Jim Parsons[Sheldon and James Earl Jones sing the song at the karaoke bar]
- 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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