Lisa Della Casa was a Swiss soprano most admired for her interpretations of major heroines in operas by Wolfgang Amadeus Mozart and Richard Strauss, and of German lieder. She was also described as “the most beautiful woman on the operatic stage”.
From Wikipedia (https://en.wikipedia.org/wiki/Lisa_Della_Casa) under Creative Commons Attribution CC-BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0/legalcode)