Hariclea Darclée "Roméo et Juliette" (Juliette); Jacques Halévy "La Juive" (Rachèle); Ruggero Leoncavallo "I Pagliacci" (Nedda) – opera interpreted in première for Romania at Bucharest National Theatre in 1903; Ruggero Leoncavallo "Zaza" (Zaza); Luigi Mancinelli "Hero e Leandro" (Hero) – opera composed for her voice and interpreted in prima assoluta at Madrid, in 1897; Pietro Mascagni "Cavalleria rusticana" (Santuzza) – oper interpreted in première for Romania at Bucharest National Theatre in 1891; Pietro Mascagni "L’amico Fritz" (Suzel) – opera interpreted in première for Teatro Della Pergole of Florence in 1891 and for Bucharest National Theatre in 1910; Pietro Mascagni "Iris" (Iris) –
Mildred Miller Met was on December 3, 1974 as Lola in "Cavalleria rusticana" with Elinor Ross as Santuzza, Harry Theyard as Turiddu, and John Nelson conducting. While performing at the Met, Miller also appeared as a guest artist on the stages of many opera houses throughout the world. She was a frequent performer at the Opern- und Schauspielhaus Frankfurt from 1959-1973. She also made appearances at the San Francisco Opera, Lyric Opera of Chicago, Cincinnati Opera, San Antonio Grand Opera Festival, Pittsburgh Opera, Kansas City Opera, Fort Worth Opera, and Opera Pasadena. She was a busy recitalist as well, appearing in concerts