- Fun with Flags(uncredited)Performed by Simon Helberg & Kunal Nayyar[Howard and Raj perform the song in Sheldon and Amy's latest episode of Fun with Flags]
- History of Everything(uncredited)Written by Barenaked LadiesPerformed by Barenaked Ladies[Series theme song played during the opening titles]
- Star Trek Theme(uncredited)Composed by Alexander CouragePerformed by Mayim Bialik[Amy hums the tune while in bed with Sheldon]
- Also Sprach Zarathustra(uncredited)Composed by Richard StraussPerformed by Mayim Bialik[Amy hums the tune while in bed with Sheldon after he requests it]
- 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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