"George Grella dissects the creative process engineered by Miles Davis album, delves into the motivations that led its creator to break with the basics of swing and incorporate influences from rock and unprecedented use of recording techniques in jazz . Grella also devotes two chapters to study the outstanding technical features of each of the six items on the double LP ... and explores with passion, wit and analytical rigor [the] constellation of musical, social and psychological forces that came together to produce one of the most revolutionary works of contemporary music." - El Intruso (translated from Spanish)