Post-production
There was significant editing done to the recorded music. Short sections were spliced together to create longer pieces, and various effects were applied to the recordings. Enrico Merlin reports:
Bitches Brew also pioneered the application of the studio as a musical instrument, featuring stacks of edits and studio effects that were an integral part of the music. Miles and his producer, Teo Macero, used the recording studio in radical new ways, especially in the title track and the opening track, "Pharaoh's Dance". There were many special effects, like tape loops, tape delays, reverb chambers and echo effects. Through intensive tape editing, Macero concocted many totally new musical structures that were later imitated by the band in live concerts. Macero, who has a classical education and was most likely inspired by the 1930s and 1940s musique concrète experiments, used tape editing as a form of arranging and composition.
"Pharaoh's Dance" contains 19 edits – its famous stop-start opening is entirely constructed in the studio, using repeat loops of certain sections. Later on in the track there are several micro-edits: for example, a one-second-long fragment that first appears at 8:39 is repeated five times between 8:54 and 8:59. The title track contains 15 edits, again with several short tape loops of, in this case, five seconds (at 3:01, 3:07 and 3:12). Therefore, Bitches Brew not only became a controversial classic of musical innovation, it also became renowned for its pioneering use of studio technology.
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