At first, he enjoys the club, but he becomes so immersed in the music that he is carried "out-of-this-world" to a manic fantasy realm filled with surreal imagery (including caricatures of Adolf Hitler, Hideki Tojo and Joseph Stalin).
From Friz Freleng's "products come to life" Merrie Melodies short, September In The Rain (1937), the recorded performance of "Nagasaki" is re-used completely intact, and the "Fats Waller" cat, "Louis Armstrong" trumpeter, jitterbugging woman and the trio of singing bartenders are re-purposed for this cartoon.
Of the cartoons included in the Censored Eleven, animation historians and film scholars are quickest to defend the two directed by Bob Clampett: Coal Black and de Sebben Dwarfs and Tin Pan Alley Cats.
The former, a jazz-based parody of Walt Disney's Snow White and the Seven Dwarfs, is frequently included on lists of the greatest cartoons ever made, while the latter is a hot jazz re-interpretation of Clampett's short Porky in Wackyland (1938).
All of the faces you see in Tin Pan Alley Cats and Coal Black and de Sebben Dwarfs are caricatures of real musicians he hung out with at the Central Avenue jazz and blues clubs of the '40s.
Warner Home Video has issued restored clips of the film as a part of a supplementary documentary on Bob Clampett on disc three of the Looney Tunes Golden Collection: Volume 2 DVD collector's set.