"The Mad Maestro" is an MGM cartoon made just before the studio began making great cartoons, such as Tom & Jerry. After leaving Looney Tunes a few years before, the Harmon-Ising team moved over to MGM and there they made films nearly as insipid and useless as the stuff they'd been making for Warner Brothers/Looney Tunes. It wouldn't be until the early 40s and directors like Tex Avery and the Hanna-Barbera team came to MGM and the quality of the films increased dramatically.
Now I am not saying "The Mad Maestro" is a terrible film...and for Harmon-Ising, it's one of their better ones. Like most of their cartoons, this one is not cutesy....though they did seem to love music and singing in their shorts...and this one is about an orchestra. All sorts of things happen which are kind of humorous....excellent for the 1930s but to be eclipsed easily in the 40s when cartoons took on an edgier and funnier tone.