Ballet by Pyotr Ilyich Tchaikovsky that received its premiere in 1877 (4,4)

I believe the answer is:

swan lake

(Other definitions for swan lake that I've seen before include "Well-known ballet" , "piece of elegance" , "8 [BALLET]" , "Tchaikovsky's ballet about noble bird" , "dance acts" .)

I've seen this clue in The Mirror.

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