"Nagasaki" is an American jazz song by Harry Warren and Mort Dixon from 1928 and became a popular Tin Pan Alley hit.
The silly, bawdy lyrics have only the vaguest relation to the Japanese port city of Nagasaki; part of the humor is realising that the speaker obviously knows very little about the place, and is just making it up.
It was one of a series of US novelty songs set in "exotic" locations popular in the era starting with Albert Von Tilzer's 1919 hit "Oh By Jingo!
Others who performed the song include the Mills Brothers, Fats Waller, Billy Costello, Fletcher Henderson, Cab Calloway, Nat Gonella, Gene Krupa, Don Redman, Django Reinhardt, Louis Jordan, Adolph Robinson,[2] Stéphane Grappelli, Chet Atkins and organist George Wright.
Willie "The Lion" Smith performed and recorded the song throughout his career; although he sang different lyrics that he changed back in his vaudeville days.