In 1930 she sang the role of Isolde ("Tristan und Isolde") at the Paris Opéra for the first time and met with an ecstatic reception. Her physical beauty —she was tall, slim and blonde— and her strong, even voice made her ideal for the part. She went on to sing it again in Paris in 1938 (this time in German, conducted by Wilhelm Furtwängler), and in London in 1939 (at the invitation of Sir Thomas Beecham). In July 1939 she became the first Frenchwoman to sing Isolde at Bayreuth (under the baton of Victor de Sabata). At Bayreuth, she established friendships with members of the Wagner family. She was even complimented by Adolf Hitler, who said she was the finest Isolde that he had heard.