What is the name of the classical ballet piece played during episodes 6 and 7 of!

Question: It is played during the basement 'torture' scene set in Derek's flash-forward, and also during Cameron's ballet scene at the end of episode 7.

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Answers: It is played during the basement 'torture' scene set in Derek's flash-forward, and also during Cameron's ballet scene at the end of episode 7.

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"Nocturne in C-sharp Minor" by Chopin

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