https://en.wikipedia.org/wiki/Fiddlin'_Around
Fiddlin’ Around (alternately titled Just Mickey) is a 1930 animated short film produced by Walt Disney Productions and released by Columbia Pictures as part of the Mickey Mouse film series. It was the sixteenth Mickey Mouse short to be produced, the first of that year.
The film is a one-person show with Mickey Mouse playing a violin on stage; Mickey is the only character to appear in the film, apart from the unseen audience including an equally unseen heckler. It was directed by Walt Disney and is the first Mickey cartoon not animated by Ub Iwerks. Along with other Mickey Mouse shorts produced the same year, Fiddlin Around entered the public domain on January 1, 2026.
Seems like more of an animation showcase than entertainment. The animation is well done though, especially the facial expressions and hand movements. It’s weird to hear his voice when he speaks, like a bad impersonation of his later voice.