The recording of this concert, not released until 1973 and only in Japan, took place on April 10, 1970 at the Carousel Ballroom, where Bill Graham, the legendary west coast impresario of psychedelic rock, had moved his Fillmore Auditorium in 1968. Steve Grossman, who replaced Wayne Shorter, used only the soprano saxophone, an instrument more capable than the tenor of penetrating the wall of sound produced by the decidedly free and powerful rhythm section, which was pervaded by the electronic effects created by Chick Corea’s electric piano. On its first release, the four sides were simply titled “Black Beauty Part 1,” “Part 2,” etc. Admittedly, identifying these pieces, which flowed into each other in an unbroken medley, was not easy. Although fragments of “I Fall in Love Too Easily” and “The Theme” (Miles’ sign-off since the 1950s) remained, he was in the process of leaving behind his popular standards. Aside from the very abstract “Masqualero” by Wayne Shorter and “Directions,” his habitual opening number borrowed from Joe Zawinul, his program was drawn from In A Silent Way, Bitches Brew, and the Jack Johnson sessions, completed three days before the concert.