This song is from the Gulliver's Travels cel-animated Technicolor feature film produced by Max Fleischer and directed by Dave Fleischer for Fleischer Studios.

 

There is a nice bio and picture of Glenn Miller on the back.

 

Released to cinemas in the United States on December 22, 1939 by Paramount Pictures, the story is a very loose adaptation of Jonathan Swift's 1726 novel of the same name, specifically the first part which tells the story of Lilliput and Blefuscu, and centers around an explorer who helps a small kingdom who declared war after an argument over a wedding song.

 

The film was the Fleischer Studios' first feature-length animated film, as well as the second animated feature film produced by an American studio after Walt Disney Productions' Snow White and the Seven Dwarfs, as Paramount had commissioned the feature in response to the success of that film.