In reply to Andy_B39:
He says "swing it" but it's in straight 8s :P
I used to like Kid Ory and Jack Teagarden but after a while found them a bit crude.
Louis Armstrong managed to put some cool rhythm and different notes into it.
After a while 40s Jazz felt a bit samey and I began to like Miles Davis. It's as if he took the melody to another level where it could almost be mistaken for not being jazz at all. When you would expect a blue note, he'd play a seventh or a major second (completely normal un-jazzy notes). It sounds hot because it's not what you expect.
Maybe this reflects Jazz over the century. By the end cool jazz is whatever the standard jazz isn't.
I think the solos in this link say what I like about Miles Davis