Premiered this song in Broadway musical Rosalie. It was written one year earlier for musical Funny Face (with Fred & Adele Astaire) but was skipped for avoiding confusion with another song with that title and administred by the same music publisher. That other How Long Has This Been Going On (Benny Davis/Pete Wendling) was recorded by Fred Elizalde, Lou Gold, Sam Lanin, Harry Hudson, Louise Carlyle & Warren Galjour.
Benny Goodman [vocal by Peggy Lee]
Audrey Hepburn [in film Funny Face, again with Fred Astaire]
Louis Armstrong [with Oscar Peterson]
Elvis Costello [for George Jones]
MJ Cole [based upon a version by Carmen McRae]