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In page Gertrude Grob-Prandl:

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Grob-Prandl was born in Vienna and studied at the Vienna Academy of Music with Singer-Burian.[1] She originally intended to become a piano teacher but the professors at the conservatory began to notice the size of her voice and she was placed in a singing class. Besides size, her voice had a distinctive burnished timbre and a tight, brisk, consistent vibrato.[citation needed] She made her debut in 1939 at the Vienna Volksoper as Santuzza in Cavalleria rusticana.[1] She graduated to heavier roles such as Isolde, Brünnhilde and Turandot. She retired in 1972.