Tetragon is tenor saxophone virtuoso Joe Hendersons second album on the Milestone label, where he continued to develop his sound in the post-bop realm before venturing further into the spiritual jazz realm later in his career, joined by a world-class ensemble featuring Ron Carter, Jack DeJohnette, Kenny Barron, Louis Hayes, and Don Friedman. TRACKLIST: Tetragon Track List (Vinyl) Side A1. Invitation2. R. J.3. The Bead GameSide B1. Tetragon2. Waltz For Sweetie3. First Trip4. I\’ve Got You Under My Skin