He was guest soloist in Munich, Frankfurt, Milan (La Scala, in "Arabella", 1970; "Das Rheingold", 1973; "Fidelio", 1978; and "Lohengrin", 1981), and Lisbon. He began his now legendary association with Wagner and his Heldentenor roles at Bayreuth in 1969, where he sang the Helmsman in "The Flying Dutchman". The major Wagnerian roles followed in quick succession: Erik in 1970, Lohengrin in 1971, Walter in 1973, Parsifal in 1975, Siegfried in 1976, Tristan and Tannhäuser in 1981. He has since sung these roles at major opera houses throughout the world, including the Metropolitan Opera, where he was seen in "Lohengrin" (1976, conducted by James Levine) and "Ariadne auf Naxos" (1979).