Ok, on a serious tip, in the popular song vein I've always found Billy Strayhorne's
Lush Life to have the oddest chord progressions. Now, I'm looking at it from a singer's point of view since that's my background. Crooner, Frank Sinatra, never sang it publicly because of its difficulty but after he passed someone released his attempts and (thanks to this thread) I'm just getting around to listening to it now. First, here's a nice run down of
the song's unusual construction. Sinatra's aborted takes:
A favorite take by Ella Fitzgerald & Duke Ellington. Here you can really hear the chords as Duke plays them. But not every singer (Sinatra, to wit, can handle them as adroitly as Ella. And, of course, she never sang anything strictly
as written). I like this take better than her famous recorded version.