From March to September 1970, together with nineteen other musicians, he performed works by Stockhausen (including Hymnen, Spiral, Pole, and Aus den sieben Tagen ) in the spherical auditorium of the German Pavilion at Expo '70 in Osaka, Japan. Back in Europe, he continued his association with Stockhausen, taking part in the world premieres of Sternklang (1971) and Alphabet für Liège (1972) (Stockhausen and Vetter 1996, 95 and 98).
Hymnen |
In 1966–67 he was an independent collaborator at the Electronic Studio of the WDR, where he assisted Karlheinz Stockhausen with the production of his electronic work Hymnen.
Specific works include Tony Scott's Music for Zen Meditation (1964), Karlheinz Stockhausen's Mantra (1970), Hymnen (1966–67), Stimmung (1968), and Aus den sieben Tagen (1968), Olivier Messiaen's Quartet for the End of Time (1941), and Ben Johnston, whose Visions and Spells (a realization of Vigil (1976)), requires a meditation period prior to performance.