 That same year she made her first appearance at the Vienna State Opera where she returned periodically through 1986 in such roles as Ariadne in "Ariadne auf Naxos", Desdemona in "Otello", Leonore in "Fidelio", Rezia in "Oberon", and the title role in "Turandot".In 1960, Bjoner made her United States debut with the San Francisco Opera as Elsa in Wagner's "Lohengrin" and her debut at the Bayreuth Festival as Freia, Helmwige, and Gutrune in Wagner's "The Ring Cycle", both of them critical successes.That same year she earned contracts with the Royal Swedish Opera and the Norwegian National Opera which made her a repeat performer in those houses during the 1960s and 1970s.