Gertrude Grob-Prandl (11 November 1917 – 16 May 1995) was an Austrian Wagnerian soprano. Grob-Prandl was born in Vienna and studied at the Vienna Academy of Music with Singer-Burian. 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. She made her debut in 1939 at the Vienna Volksoper as Santuzza in Cavalleria rusticana. She graduated to heavier roles such as Isolde, Brünnhilde and Tu