The BMI list of 233 (or whatever) that M Ted mentioned is a nice list for a fan; a good cross-section of his work. I really can't see the point of roping out his "genuine originals."
The important thing is the form that developed or evolved to the point that many people try to put a fence around it. I guess that I don't much care if the piece is "100% original" or a make-over; I can appreciate his music without worrying overmuch about that.