Duet for alto saxophone and cello, recorded by Hemphill with Abdul Wadud on the album Live in New York (1978).
From Marty Ehrlich: Although Hemphill was a prodigious composer of notated music, he chose at times to do an open improvisation with his colleagues on a given recording. In this case, Hemphill added titles to the improvised pieces: “Echo 1 (Morning)” and “Echo 2 (Evening).”
Found on: Live in New York.