Shortly after, she made her debut at La Scala in Milan, where the major part of her career and greatest triumphs were to take place. In collaboration with conductors like Carlo Maria Giulini, Leonard Bernstein, Gianandrea Gavazzeni, and directors like Franco Zeffirelli and Luchino Visconti, lavish productions of works such as Cherubini's "Medea", Spontini's "La Vestale", Bellini's "La sonnambula" and "Norma", Donizetti's "Anna Bolena" and "Poliuto", Verdi's "La traviata" and "Un ballo in maschera", were made especially for her to great acclaim. 