here is a section from John Szwed:
Teo (Macero) sent Ralph Gleason some advance tapes of Bitches Brew, and Gleason, one of Miles' greatest defenders and apologists, mock-complained about them: "No wonder jazz is dead, guys like you are killing it." Teo responded: "I may have killed jazz, but I have established a new kind of music. What have you done lately?" ...... To make sense of this record, listeners would have to abandon their belief in the improvised solo as the apotheosis of jazz. Form would have to be rethought, suspending the weight put on balanced, narrative-like compositions that resolve to well-made endings. If there was form in Bitches Brew, it was through-composed, repetitive, but slowly unfolding - "like Chopin," said Teo.