Elmer Fudd hosts a parody of Fantasia with Bugs Bunny, Porky and Daffy.

Public domain (US): Published 1943; 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/ACornyConcerto1943BugsBunny).