 In 1966 she performed for the first time at the Palais Garnier in Paris which led to a contract with the Opéra National de Paris through 1969.The year 1968 proved to be a banner year for Żylis-Gara.She made her London's Royal Opera House debut as Violetta in Verdi's "La traviata" and sang Donna Elvira for her debuts at the Salzburg Festival in the summer, the San Francisco Opera on November 8, and her Metropolitan Opera debut on December 17.