The Big Bang Theory season 8 episode 6 soundtrack

Sheldon and Raj test whether they could survive a dark-matter research expedition in a salt mine by simulating the conditions in a steam tunnel deep underground. Leonard and Penny seek advice from Howard and Bernadette after they fight about money.

• Dark As a Dungeon — Merle Travis

  Raj and Sheldon are in the steam tunnels under the university and Sheldon sings this song

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