Art Ensemble of Chicago & Dreaming of the Master

From a performance probably in the 70s. The song as I know it from the studio recording kicks in at 3:57.

Speculating sometimes on personnel but . . . Lester Bowie (trumpet), Malachi Favors Maghostut (bass), Joseph Jarman (saxophone), Roscoe Mitchell (saxophone), Don Moye (drums), pretty much everyone (percussion instruments).