Even the prickly Miles Davis was forced to concede that the huge success of his early-70s albums was the result of his collaboration with producer Teo Macero. Here we have four CDs of music, from which, by cutting, splicing and generally reshaping the original performances, Macero created the vinyl double album Live at the Fillmore that the public bought in 1970. So is this the unadulterated truth at last or just raw material? It certainly gets close to chaos at times, but these live shows often did. From that point of view at least, it's truly authentic.