Underrated jazz greats


I listen to all sorts of music, but mostly jazz. There are many musicians who, for whatever reason, don't attract the attention that their great gifts possibly deserve. I would be interested to know who others think are hidden gems in the jazz world, who have contributed substantially to the genre.

I will begin with two musicians who I believe are outstanding, and deserving of the highest recognition.

1) Lew Tabackin - an outstanding tenor player, and a phenomenal jazz flutist in my view.

2) Sir Roland Hanna - tremendous command of the keyboard, and he thought around the perimeter of pieces to make them both musically and intellectually satisfying.

Very interested in others' thoughts.
stewartr
Horace Tapscott - a longtime mainstay of the LA jazz community was a piano player with a unique way of establishing musical momentum. His was the sound of inevitability.

Lenny Breau - So much talent that it had to hurt. Calling him a jazz player is too limiting. He was a universal musician.
Paul Desmond was imho a "quiet" but phenomenal genius of the sax. I also think he was the "wings beneath" Dave Brubeck. With a lesser player on sax I think much of Brubecks work wouldn't have had near the popularity and recognition. In fact, as a big fan of the Dave Brubeck Quartet-with Paul Desmond--I don't think Brubeck had anywhere near the same output- in quality, musicality, inventiveness or popularity- after Desmond. I think the gel with Desmond was "magic", pure & simple. Probably as great as any 2 collaborators.