Werner. "Art and the Revolution". Music and Politics. Translated by Peter Labanyi. New York: Cornell University Press, 1982. 178–183. Henze, Hans Werner. "Natascha Ungeheuer". Music and Politics. Translated by Peter Labanyi. New York: Cornell University Press, 1982. 184–193. Jacobshagen, Arnold. "Musica impura. Hans Werner Henzes Der langwierige Weg in die Wohnung der Natascha Ungeheuer und die Studentenbewegung", in: Rebellische Musik. Gesellschaftlicher Protest und kultureller Wandel um 1968 (musicolonia, vol. 1), Arnold Jacobshagen and Markus Leniger (eds.), Cologne (Christoph Dohr) 2007, pp. 109–124 External links Operas Chamber operas German-language operas Operas by Hans Werner Henze 1971 operas Operas based on literature