The ballet opens at Prince Siegfried's 21st birthday party, where Siegfried's mother scolds him for not finding a wife; she plans for him to choose a spouse at a ball the following evening. After the "Dance of the Goblets," Siegfried, his tutor Wolfgang, and his friend Benno go hunting. They are about to shoot a swan when it turns into the beautiful Odette. Odette reveals she was cursed by the sorcerer von Rothbart to turn into a swan during the daytime. The curse can only be broken if one who has never loved before declares his love for her. Odette and the other victims of von Rothbart's curse live on the title lake, which was created by Odette's mother's tears. Their presence is usually signified by one of the ballet's recurring musical themes, a B-minor motif for oboe and harp. Odette and Siegfried begin to fall in love, but morning breaks and Odette returns to her swan form. At the palace, the ball begins with nationalistic dances, including Neapolitan and Hungarian dances and a mazurka. Von Rothbart arrives with his daughter Odile, disguised to look like Odette. (Odette and Odile are normally played by the same ballerina, who wears white as Odette and black as Odile.) They successfully trick Siegfried into declaring his love for Odile, dooming Odette to live as a swan forever. He hurries back to the lake, where he and Odette drown themselves, killing von Rothbart in the process. The exact ending varies from production to production, with some happier than others.