The Chinese Nightingale is a 1935 Happy Harmonies cartoon.
A mini-musical, telling in song (through a trio of Chinese girls) the fairy tale of a beautiful nightingale, beloved of the Chinese emperor, who is gladdened by its song. The emperor is moved to play his own song. One day, the Japanese send a music box with a mechanical bird; the nightingale feels rejected and flies away to raise a family. But soon, the clockwork breaks down, and the emperor dispatches his crow to go look; meanwhile, the emperor grows sicker with the passing months. The nightingale is persuaded to return, at which time the emperor sings "Happy Days are Here Again."