Happy As The Day is Long  The 1933 Cotton Club Parade   had an Arlen/Koehler rhythm song which was used to showcase the club bandleaders Cab Calloway and then Duke Ellington, This a rousing, take-no--prisoners jazz number artfully sung by Rebecca Kilgore, noted cabaret and standards stylist and a hot small group ensemble.
Arlen, as a teenager in Buffalo, led his own jazz ensemble as pianist, vocalist and arranger.

https://youtu.be/F9-M0BtXX3A