Trio Music, a collaboration of Chick Corea, Miroslav Vitous, and Roy Haynes.
The first album is just improv jazz, as if these 3 guys' improv could be labeled as "just".
Second album is their homage to Thelonious Monk.
Just bad ass, both albums, ECM GmbH
Bought used, one (..two) of the best albums I have bought, condition-wise. Killer.