In the 1st work: Eva Maria Rogner, soprano ; Maria Bergmann, piano ; [members of the] Orchestra della RAI di Roma ; Pierre Boulez, conductor. In the 2nd work: Carla Henius, alto ; various instrumentalists ; Bruno Maderna, conductor. In the 3rd work: Residentie Orkest Aja ; Bruno Maderna, conductor
The 1st work for soprano, harp, vibraphone, bells, and percussion, with piano and celeste added in the 2nd Improvisation; the 2nd work for alto, flute, guitar, vibraphone, viola, xylomarimba, and percussion.