- Sabre Dance(uncredited)Composed by Aram KhachaturyanPerformed by Simon Helberg and Kunal Nayyar[Howard and Raj sing the tune during Leonard performing Secret Agent laser chess obstacle]
- History of Everything(uncredited)Written by Barenaked LadiesPerformed by Barenaked Ladies[Series theme song played during the opening titles]
- Blow the Man Down(uncredited)TraditionalPerformed by Kaley Cuoco and Jim Parsons[Leonard, Howard and Raj, in the hallway, hear Penny and Sheldon singing the song in her apartment]
- She'll Be Coming 'Round the Mountain(uncredited)TraditionalPerformed by Kaley Cuoco and Jim Parsons[Penny and Sheldon sing the song as they work on the 1,000 unit order]
- I've Been Working on the Railroad(uncredited)(Someone's in the Kitchen with Dinah)Traditional[Leonard, Howard, Penny and Sheldon sing the song in their tired state as they work on the 1,000 unit order]
- Sixteen Tons(uncredited)Written by Merle TravisPerformed by Jim Parsons[Sheldon statrts singing the song after Penny wakes him up]
- Sabre Dance (reprise)(uncredited)Composed by Aram KhachaturyanPerformed by Simon Helberg and Jim Parsons[Howard and Sheldon sing the tune during Raj performing Secret Agent laser pizza lunch obstacle]
- 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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