Bernd Alois Zimmermann
Other composers were Krysztof Penderecki with "Fluorescences" (1961), "De natura sonoris Nr. 2" (1971) and the opera "Ubu Rex" (1990), Bernd Alois Zimmermann with "Stille und Umkehr" (1970), George Crumb with "Ancient voices of children" (1970), John Corigliano with "The Mannheim Rocket" (2001).