Her vast repertory eventually grew to encompass Princess Eboli in Don Carlo which she sang at La Scala in Milan, in Salzburg and in Vienna, the title-role in Carmen, Ulrica (Un ballo in maschera), Monteverdi's Octavia (L'incoronazione di Poppea), Dido (Les Troyens), Kundry (Parsifal), Klytemnestra (Elektra) and contemporary roles by von Einem and Orff.
He performed as a soloist, but above all sought as a collaborator with singers such as Elly Ameling, Gundula Janowitz, Christa Ludwig, Walter Berry, Dietrich Fischer-Dieskau, Peter Schreier, Brigitte Fassbaender and Jessye Norman.
Robert Kerns made relatively few recordings, the best known being Madama Butterfly, opposite Mirella Freni, Luciano Pavarotti, Christa Ludwig, under Herbert von Karajan.
She appeared at La Scala as Cherubino, and became established as one of the Wiener Ensemble (together with Irmgard Seefried, Elisabeth Schwarzkopf, Christa Ludwig, Lisa della Casa, Anton Dermota and others).
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There he took part in master classes of singers like Renata Scotto, Christa Ludwig, Teresa Berganza, Ileana Cotrubas and sung roles in the Magic Flute (Tamino), Carmen (Remendado), The Barber of Seville (Almaviva), Gianni Schicchi (Rinuccio), among others.