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Carla Henius was a German operatic soprano and mezzo-soprano, voice teacher and librettist. She played a decisive role in promoting recent works by composers such as Arnold Schoenberg, Karlheinz Stockhausen and Luigi Nono for the stage. She wrote the libretto for an opera by Aribert Reimann. From Wikipedia (https://en.wikipedia.org/wiki/Carla_H...) under Creative Commons Attribution CC-BY-SA 3.0 (http://creativecommons.org/licenses/b...)