As night falls and the city lights come to life, a magnificent theater located in a bustling district is about to host a spectacular opera performance. The performers are led by Mickey (voiced by Walt Disney) and his troupe. The theater is packed with eager audiences who have come from far and wide. Behind the curtain, Mickey observes the audience, while the mischievous Pluto (voiced by Pinto Colvig) causes trouble nearby. After being chased away by Mickey, Pluto accidentally bumps into the props of a magician scheduled to perform the next day. Among them, a rabbit hidden inside a top hat catches his attention. Soon, music begins to play, and as Mickey conducts, the curtain rises. The plump Clara (voiced by Florence Gill) and Donald Duck (voiced by Clarence Nash) take the stage one after another to sing. Just then, Pluto chases after the hat and bursts onto the stage, causing quite a commotion...