It was during this time and the years that followed that Eggerth began singing the most demanding coloratura repertoire by composers including Rossini, Meyerbeer, Offenbach and Johann Strauss II.

It was on the set of the 1934 film Mein Herz ruft immer nach dir (My Heart is Calling You, music Robert Stolz) that she met and fell in love with the young Polish tenor, Jan Kiepura.

On February 10, 1938, Jan Kiepura made his debut at New York's Metropolitan Opera, singing the role of Rodolfo in Puccini's La bohème.

She subsequently signed a contract with Metro-Goldwyn-Mayer in Hollywood and, during the early 1940s, made two movies with Judy Garland: For Me and My Gal in 1942 (also Gene Kelly's first major film role) and Presenting Lily Mars in 1943.

In 1943, they starred together on Broadway at the Majestic Theater in a revised production of Lehár's The Merry Widow, with Robert Stolz conducting and choreography by George Balanchine.

[4] After World War II, they returned to France touring and making films, such as Valse Brillante (1949) and The Land of Smiles (1952), before bringing The Merry Widow to London's Palace Theatre in 1954.

Throughout her career, Eggerth maintained active recital tours throughout Europe, Canada and the United States, combining her extensive repertoire of lieder, opera, film songs, and especially Viennese operetta.

In 1982, she returned to the American stage to co-star in the Tom Jones/Harvey Schmidt musical Colette opposite Diana Rigg in Seattle and Denver, and later in Stephen Sondheim's Follies in Pittsburgh.

In 2001, Eggerth returned to London for "An Interview-in-Concert" at a sold-out Wigmore Hall,[4] accompanied by conductor-pianist Alexander Frey and hosted by British author and critic Brendon Carroll.

[4] Eggerth was awarded many major artistic decorations from Austria, Germany, Poland, and Italy in recognition of her accomplishments in operetta, theatre and film.