From all account, the inventor of the loop. It is interesting when researching him the evolution of the loop - from records to master tape loops to digital loops. This guy is the king of them and brings it to a whole other level. You are trapped in the loop but it also creates a whole new reality out of the compressing of time - especially when listening to it. The nuances of recording that would otherwise be overlooked are accentuated.
https://www.vice.com/en_au/article/78wa9q/original-creators-experimental-composer-steve-reich