What I'm listening to today: "Piece for tape recorder", Vladimir Ussachevsky
This piece was recorded in 1956 but sounds highly ahead of its time, like if the "drug freakout sequence" music from a 1970s film soundtrack were composed as intentional music, or like if the interstitial junk in a Kid A era Radiohead album were expanded to a full song. I really like this, it gets so much mileage out of tape-jank & exactly four oscillator circuits in a hand-wired configuration.