Tracklist:

1. Invitation
2. R. J.
3. The Bead Game
4. Tetragon
5. Waltz For Sweetie
6. First Trip
7. I've Got You Under My Skin

Tetragon is tenor saxophone virtuoso Joe Henderson’s 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.