‘Cool’ and ‘Elegant’ aren’t the same thing but are interstitial . The coolest musician that I ever spoke with was undoubtedly McCoy Tyner. Completely different but a close second was Delbert McClinton so real authenticity might be a factor. Honorable mention to Jon Faddis with whom I shared a stalled elevator at the Blackstone in Chicago long ago. A kind and well spoken man; also the best dressed guy I have ever seen.