The Emperor's Nightingale
Císařův slavík (original)
Adaptation of a fairy tale by Hans Christian Andersen, about an emperor who prefers the tinkling of a bejeweled mechanical bird to the song of a real nightingale. When the Emperor is near death, the nightingale's song restores his health.
Starring Helena Patočková, Jaromír Sobota, Boris Karloff
Watch "The Emperor's Nightingale" on Amazon released in 1949. It's a fantasy and animation movie, and has a rating of 6.7 out of 10 from Imdb which is usually fine for this kind of movie, and is currently only available for purchase or rent.