Snippets of the original session tapes from when Stockhausen recorded the 12-year-old boy treble Josef Protschka whose voice would form such a central part of Stockhausen's electronic/electro-acoustic masterpiece Gesang der Jünglinge. The recordings were made at the composer's Cologne studio in 1955 and 1956. These notes/pitches/frequencies are not part of the western system, they're microtonal and complex ... composed by Stockhausen using serial techniques. These tapes have been heard by only a handful of people and they certainly have never been broadcast anywhere in the world, ever!
Astonishingly, Sean has managed to reconstruct Stockhausen's original gear through a combination of technical ingenuity and a spot of eBay-ing, and has made this old/new set-up make some of the noises that Stockhausen produced in Gesang. Compare Sean's version of those seductive, transcendent swarms of impulses at the start of the piece with Stockhausen's.