Musique concrete is extremely important to minimal.

Musique Concrete is essentially about Acousmatic sound, and minimal is very much about that (at least the good stuff). Especially as the trend is moving away from purely synthetic sounds into more electroacoustic tones.

Abstract, tonally complex textures, acousmatically obscured from source, looping techniques etc. More prominenet in the Berghain stuff, but it`s a massive chunk of the root theory of mnml.