Are you sure it's McCoy Tyner making the hum and grunt noises? He's not especially known for this, as far as I know. Keith Jarrett, on the other hand, is well known for expressing himself with grunts, etc., during piano performances.
Maybe you're thinking of Elvin Jones (drummer)? He recorded with McCoy, and he's a grunter as I recall, although I'd have to to some checking to see which recordings I've got in mind. Maybe you've got McCoy taking credit for Elvin's grunting?
Maybe you're thinking of Elvin Jones (drummer)? He recorded with McCoy, and he's a grunter as I recall, although I'd have to to some checking to see which recordings I've got in mind. Maybe you've got McCoy taking credit for Elvin's grunting?