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The Closure Alternative
The Big Bang Theory
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History of Everything
(uncredited)
Written by
Barenaked Ladies
Performed by
Barenaked Ladies
[Series theme song played during the opening titles]
Buffy the Vampire Slayer Theme
(uncredited)
Written by
Nerf Herder
Performed by
Nerf Herder
[The music is playing when Leonard and Penny watch the show, then later when Penny and Bernadette watch the show]
The Star Spangled Banner
(uncredited)
Music by
John Stafford Smith
Lyrics by
Francis Scott Key
Performed by
Mayim Bialik
[Amy sings the song while accompanying herself on the keyboard]
Pop Goes the Weasel
(uncredited)
Traditional
[An instrumental version of the song is played on the toy music box]
The Star Spangled Banner
(uncredited)
Music by
John Stafford Smith
Lyrics by
Francis Scott Key
Performed by
Jim Parsons
[Sheldon sings the song to completion after Amy leaves the apartment]
History of Everything (Instrumental version)
(uncredited)
Written by
Barenaked Ladies
Performed by
Barenaked Ladies
[Instrumental version of series theme song played over the closing credits]
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