 The following year, he was there a second time to work on "Men of the Sky", released in 1931 without his songs, and a 1930 film version of "Sunny".There was a public reaction against the early glut of film musicals after the advent of film sound; Hollywood released more than 100 musical films in 1930, but only 14 in 1931.Warner Bros. bought out Kern's contract, and he returned to the stage.