Geza von Bolvary made a few very good films. This early sound film (it premiered in Berlin on October the 12th, 1930) is one of them. "Das Lied ist aus" (The Song is Over) is based on a script by Walter Reisch and accompanied with music/songs by Robert Stolz. Add - in this case - actor Willi Forst, and you have the "co-ingenious four-some" (imdb), which worked repeatedly together.
