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
How about abdullah Ibrahim. If you can find it, Water from an Ancient Well. Great compositions ( Ibrahim is an Ellington disciplle), terrific band and outstanding recording.
'Water from an Ancient Well' is available on Amazon. Ibrahim was A.K.A. 'Dollar Brand'. Check under both names to see all his stuff.

Some people are not so much underrated, as they are not popular. And this can be for various reasons. Appearance, age, gender, race, style of play etc.... But the guardians, the enthusiasts, the keepers of the flame so to speak, they know!!
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.