Swan Lake is a ballet-fairy tale structured in four acts, which was commissioned by the Bolshoi Theater in 1875 and premiered in 1877. The music was composed by Pyotr Ilyich Tchaikovsky; It's about your op. 20 and is the first of his ballets. Read on Wikipedia
Swan Lake is the love story of Prince Siegfried, who on a hunting trip encounters a flock of swans, falls in love with the Swan Queen, Odette, and swears his allegiance and undying love to her. As a result of a curse by the evil sorcerer Baron von Rothbart, Odette can only take human form between midnight and daybreak. Read on Detroidopera