The clip above shows Schickele introducing P.D.Q. Bach's "Classical Rap," followed by audio of the piece. Schickele explains that P.D.Q. wrote it about a neighborhood in early 19th century Vienna, but that he modified it to describe life on Manhattan's Upper West Side.
Martha and I were fortunate to attend several P.D.Q. Bach concerts some years ago. Most began when Schickele "slid down a rope suspended from the first balcony." If I recall correctly, the opening number for one was another favorite of New Yorkers, the Concerto for Horn and Hardart. For non-New Yorkers, Horn and Hardart was the company that owned the famous "Automat" restaurants.