Le Oca del Cairo

L'oca del Cairo is an opera buffa in three acts, K. 422, begun by Wolfgang Amadeus Mozart in July 1783 but abandoned in October. The complete three act libretto by Giovanni Battista Varesco remains. Mozart completed seven of the ten numbers of the first act, plus some recitative; his music amounts to about 45 minutes.
The title is usually translated as The Goose of Cairo but sometimes as The Cairo Goose. Don Pippo, a Spanish Marquess, keeps his only daughter Celidora locked up in his tower. She is betrothed to Count Lionetto, but her true love is Biondello, a wealthy gentleman. Biondello makes a bet with the Marquis that if he can rescue Celidora from the tower within a year he wins her hand in marriage. He succeeds by having himself smuggled into the tower garden inside a large mechanical goose.