What is the source of the music of Swan Lake created by Pyotr Il'yich Tchaikovsky?
Swan Lake was originally a one-act music composed by Pyotr Il'yich Tchaikovsky based on the fairy tale Swan Lake written by Mozart. Swan Lake describes the story of a young knight who defeats the devil, rescues the princess who turns into a swan and finally marries the princess. This one-act music is a birthday present from Pyotr Il'yich Tchaikovsky to his nephew.