Irene Dalis was an American mezzo-soprano singer, who had a long international career at the highest levels of world opera. In 1946, she received her bachelor's degree from San Jose State College, where she regarded herself not as a singer, but as a pianist.
From Wikipedia (https://en.wikipedia.org/wiki/Irene_Dalis) under Creative Commons Attribution CC-BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0/legalcode)
Il trovatore: Act I: Di geloso amor sprezzato (Conte, Leonora, Manrico)
Leontyne Price, Franco Corelli, Mario Sereni, Irene Dalis, William Wildermann, Teresa Stratas, Charles Anthony, Carlo Tomanelli, Robert Nagy, and Giuseppe Verdi
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Parsifal, WWV 111 / Act 1: "Nicht Dank! Haha! Was wird es helfen?" - "He! Du da! Was liegst du dort wie ein wildes Tier?" (Live)