Rhythm on the River (1940)
Popular songwriter Oliver Courtney has been getting by for years using one ghost writer for his music and another for his lyrics. When both writers meet at an inn, they fall in love and then try to sell their songs under their own name. The problem is every song publisher thinks they're copying Courtney's style.
Directed by: Victor Schertzinger
Starring: Bing Crosby, Mary Martin, Basil Rathbone, Oscar Levant, Oscar Shaw, Charley Grapewin
Links: IMDb, Movie posters, Movie stills