I got a copy of "The Lost Tapes" by Can recently, and I cannot recommend it highly enough. A magnificent 3 CD box set of unheard Can material, a project seven years in the making.
The box comes as a 10" presentation (like a reel-to-reel tape box) and besides the CDs there is a book inside that contains liner notes by Irmin Schmidt (Can's keyboard player). At one point he is talking about a track called "Graublau" which was made for a film. He says:
"I wanted to find a sound design where the sounds and noises would mix with the soundtrack but also work on their own. At home I recorded hours of short wave radio and made loops to which we then all played together in the studio. In the editing room Peter Przygodda (the editor of the film) and I compiled the shortwave radio, the music and the fades between them and the film soundtrack. At some point the sound of a propeller plane became the sound of shortwaves in which would then slowly appear a groove: the noise of the motor turned into music."
Interesting parallels, of which I am proud..
Buy the box set (I command you):