Composer Portraits: The Darmstadt Boys
Luciano Berio
Pierre Boulez
John Cage
Hans Werner Henze
Mauricio Kagel
Gottfried Michael Koenig
György Ligeti
Luigi Nono
Henri Pousseur
Karlheinz Stockhausen
Source: Ulrich Dibelius, Moderne Musik 1945-1965 (Munich: R. Piper & Co., 1966)