One of a series of pianist Thollem McDonas' Astral Traveling Sessions, a 25-album series of concerts from around the globe, performing concerts in varying configurations with 70 musicians, here with two collaborations: in Kingston, NY with the great vibraphonist Karl Berger for 3 improvisations, and in Toronto with pianist Michael Snow for an extended piano duo.

Following a 1964 Albert Ayler tour, trumpeter Don Cherry remained in Europe, working on new concepts of improvising based on form itself, developing his concepts with saxophonist Gato Barbieri, vibraphonist Karl Berger & bassist J.F. Jenny Clark, composing two brilliant albums: 1966's Communion with Barbieri, Henry Grimes & Ed Blackwell; and in 1967 Symphony for Improvisers as a septet.

After performing at a night dedicated to Ed Blackwell and Don Cherry, vibraphone legend Karl Berger invited trumpeter Knuffke to Woodstock to teach and perform with him, from which this lovely album of duets was born, 2 CDs of original compositions of free and lyrical playing.