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In page Maria Müller:

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At Salzburg, she appeared as Eurydice (1931), Reiza (1933) and Donna Elvira (1934). She made her Covent Garden debut as Eva in 1934, and sang Sieglinde in the 1937 Ring Cycles. Her large repertory included the title roles in Die agyptische Helena, Jenůfa and Gluck’s Iphigénie en Tauride, Djula in Gotovac's Ero the Joker, Pamina, Tosca and Marguerite. Müller possessed a warm, vibrant voice and sang with a rare purity of tone. (Harold Rosenthal)[citation needed]