The Big Bang Theory season 4 episode 17 soundtrack

Sheldon becomes concerned when everybody begins to hang out at Raj's apartment and discovers Leonard is the center of the group.

• Don't Go Breaking My Heart — Elton John & Kiki Dee

  [Cast performance] Zack and Kripke sing karaoke as Sheldon watches.

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• Walking On Sunshine — Katrina & The Waves

  [Cast performance] Zack, Stuart and Kripke sing karaoke.

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