A song-filled short built around caricatures of the 1930s' top crooners.

Public domain (US): Published 1932; copyright not renewed (listed in Wikipedia 'List of animated films in the public domain in the United States', source: Hurst, Film Superlist). Source: Internet Archive (https://archive.org/details/CrosbyColumboAndVallee1932HughHarmanRudolfIsing).