ARudy Behlmer explains in the DVD commentary track:The tune being played on the radio is that apotheosis of maudlin sentimentality, "Hearts and Flowers," performed in an old-fashioned-like manner, even for 1933, on what sounds like an upright piano with all the frills and trills. Presumably, this is an inside joke put in by a music editor some years later to replace the music used for the initial release of the film, that music being 'La Rosita,' a 1923 composition that became a semi-standard. The substitution probably stemmed from a music clearance situation.