Background
My first encounter with sung overtones was in 1969 at a performance of Karl Stockhausen's "Stimmung" ("Mood") in the studio of the Beethoven Concert Hall in Bonn. The atmosphere created by the entirely new way of handling vocal sounds made me astonishingly alert and curious although I had always enjoyed singing, and had sung a lot, my main interest up until then had been in playing instruments. Just as I had recently heard synthesizer music for the first time, and…
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