What I'm listening to today: "Prague", David Prescott
This was recorded in Boston in 1987 and distributed exclusively on cassette tape (by an experimental music label in Germany named "Prion Tapes"). A symphony of noise, too loud to really be "ambient", this is an hour* of feedback and mysterious unknown electronics. Coil fans take note
What I'm really trying to call your attention to here is "Side A" (the first 28 minutes) but side B does have its own nice prog vibe