Rosa Ponzillo, known as Rosa Ponselle was an American operatic dramatic soprano.
She sang mainly at the New York Metropolitan Opera and is generally considered to have been one of the greatest sopranos of the 20th century.
From Wikipedia (https://en.wikipedia.org/wiki/Rosa_Ponselle) under Creative Commons Attribution CC-BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0/legalcode)