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In page Marie Gutheil-Schoder:

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Gutheil-Schoder created the fiercely difficult single role of Arnold Schoenberg's monodrama Erwartung in 1924 in Prague; earlier that year, she performed his Pierrot lunaire. Mahler termed her "a musical genius," and she was highly regarded as a musician and singing-actress, although she seemed to be, as one Viennese critic wrote, "the singer without a voice."[citation needed]