Blanche Thebom was an American operatic mezzo-soprano, voice teacher, and opera director. She was part of the first wave of American opera singers that had highly successful international careers. In her own country she had a long association with the Metropolitan Opera in New York City which lasted 22 years. Opera News stated, "An ambitious beauty with a velvety, even-grained dramatic mezzo, Thebom was a natural for opera: she commanded the stage with the elegantly disciplined hauteur of an old-school diva, relishing the opportunity to play femmes du monde such as Marina in Boris Godunov, Herodias and Dalila."
While Thebom sang a wide repertoire which encompassed everything from Handel and Mozart to Verdi and Debussy, she was best known for her performances in the operas of Richard Wagner. Two Wagner roles with which she was particularly associated were Fricka in Die Walküre and Brangaene in Tristan und Isolde. She notably sang the latter role in the famous 1952 EMI recording made in London with Kirsten Flagstad, Ludwig Suthaus, and conductor Wilhelm Furtwängler. She is Didon in Les Troyens.
From Wikipedia (https://en.wikipedia.org/wiki/Blanche_Thebom) under Creative Commons Attribution CC-BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0/legalcode)
Richard Wagner, Ludwig Suthaus, Kirsten Flagstad, Blanche Thebom, Josef Greindl, Dietrich Fisher-Dieskau, Rudolf Schock, Edgar Evans, Rhydderch Davies, and Covent Garden Chorus
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Lucia Di Lammermoor: Sesteto
RCA Victor Orchestra, Constantine Callinicos, Mario Lanza, Blanche Thebom, Dorothy Kirsten, Giuseppe Valdegno, Nicola Moscona, Gilbert Russell, and Gaetano Donizetti
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Mild und leise wir er lächelt (Act III) [2001 Digital Remaster]