The music of 12 composers for solo instruments, combined in a general outline by Stockhausen, and realized by 11 members of the Ensemble Hudba dneska and Aloys Kontarsky, Hammond organ, performing in a large room. Each instrumental sound is miked, amplified, and fed into loudspeakers through 4 mixing consoles within the room
Notes by Stockhausen and Maiguashca on slipcase.
The original recordings, made at "Stadt Darmstadt Internationales Musikinstitut, 22. Internationale Ferienkurse für neue Musik, 1967," consisting of rehearsal and performance (Aug. 28 and 29, 1967) each 4 hr. in duration, were edited and reduced to about 62 min. duration by Mesias Maiguashca at the Studio für elektronische Musik im WDR, Aug. 26-Sept. 22, 1971.