If you grew up in the 1950's you'll recognize this 1953 animated trailer by Dave Fleischer.  In 2000 it was selected for preservation in the United States National Film Registry by the Library of Congress for being "culturally, historically, or aesthetically significant".

"Let's All Go to the Lobby"

 It promoted a theater's newly installed concession stand. The melody has been compared to "For He's A Jolly Good Fellow" but appears to be well known first as a French folk song called "Marlbrough s'en va-t-en guerre" ("Marlborough has left for the war") and to the folk song "We Won't Be Home Until Morning the 18th century                                   http://en.wikipedia.org/wiki/Let

credit:   CINEMA VILLAGE
Qualifies as  fair use under United States copyright law

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