Waltzes from Vienna, or Strauss' great Waltz, as it's called in some databases. it's a british production, through Gaumont studios. With Edmund Gwenn as the elder and Esmond Knight as the younger Strauss. The film highlights the competition between father and son. According to wikipedia dot com, Hitchcock took liberties with some of the facts, and made many changes from the stage production. Schani, Strauss the younger, is dating Resi, the baker's daughter (Jessie Matthews). Watching and hearing the bakers work inspires Schani while he's working on a waltz. Oddly, almost everyone around him conspires to keep younger Strauss from composing, but ony when someone DOES help him using trickery, it makes for the big breakthrough. and unlike most of Hitchcock's other projects, no murders in this one! according to wikipedia, Strauss the elder wanted Schani to become a banker, repeatedly tried to stop him from playing and composing. of course, you always want what you can't have. moves pretty slow, for today's standards, but mostly pretty good story. Hitchcock had already made a couple talkies by now. i found this one on the Reel Flix channel.
Review of Strauss' Great Waltz
