[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.
Irmgard Seefried once remarked that the "walls shook" when Grob-Prandl sang Turandot.
Available recordings include Donna Anna in Don Giovanni, Isabelle in Robert le Diable, Brünnhilde, Isolde, First Lady in The Magic Flute, as well as Elektra, Turandot, and Elettra in Idomeneo.