Tony, I think I disagree.
I think Jazz is how musicians freely interpret a composition, not how its written, ergo you could take any song, Feelings for example, throw in some interpretation and over time and refinement it could become a staple in the reps of players.
As you guys would know a LOT of the tunes in any of the Real Books, came about becausee guys were blowing over a set of chords, and someone came up with a really good melody and thought "hey, thats a good tune" and it then sort of hung around in the reps and others heard them and gradually adopted them as well.. It wasn't written specifically as a jazz song, it just evolved that way.
As is the case with many of the jazz tunes we hear and use today, they just eveolved from songs composed for other purposes.
Just my 2 cents.
Dennis
[This message has been edited by miden (edited 07-22-2008).]