title-roles in Arabella (she sang in the Viennese premiere on 21 October 1933, even though her mother had died earlier that day) and in Der Rosenkavalier (earlier in her career, she had also sung the role of Sophie and Octavian; when she finally added the Marschallin to her repertoire, she became the first soprano in history to have sung all three female lead roles in that opera). Her Puccini roles at the Vienna State Opera included the title-roles in Tosca, Manon Lescaut, Madama Butterfly, Suor Angelica, Turandot, Mimi in La bohème and Giorgetta in Il tabarro. In her 21 years with the company, Lehmann sang more than fifty different roles, including Marie/Marietta in Korngold's Die tote Stadt, the title-roles in La Juive by Fromental Halévy, Mignon by Ambroise Thomas, and Manon by Jules Massenet, Charlotte in Werther, Marguerite in Faust, Tatiana in Eugene Onegin and Lisa in The Queen of Spades. In the meantime she had made her debut in London in 1914, sung on tour in South America in 1922, and from 1924 to 1935 performed regularly at the Royal Opera House, Covent Garden where aside from her famous Wagner roles and the Marschallin she also sang Desdemona in Otello and Donna Elvira in Don Giovanni. She appeared regularly at the Salzburg Festival from 1926 to 1937, performing with Arturo Toscanini, among other conductors. She also gave recitals there accompanied at the piano by the conductor Bruno Walter. In August 1936, while in Salzburg, she discovered the Trapp Family Singers, later made more famous in the musical The Sound of Music. Lehmann had heard of a villa available for let and as she approached the villa she overheard the family singing in their garden. Insisting the children had a precious gift, she exclaimed that the family had "gold in their throats" and that they should enter the Salzburg Festival contest for group singing the following night. Having regard to the family's aristocratic background the Baron insisted performing in public was out of the question; however Lehmann's fame and genuine enthusiasm persuaded the Baron to relent, leading to their first public performance. In 1930, Lehmann made her American debut in Chicago as Sieglinde in Wagner's Die Walküre. She returned to the United States every season thereafter making her Metropolitan Opera debut as Sieglinde in 1934. Before Germany annexed Austria in 1938, Lehmann emigrated to the United States. There, she continued