His official debut at the Metropolitan Opera in New York

His official debut at the Metropolitan Opera in New York occurred on 28 September 1968 when he substituted for Franco Corelli, in Cilea's Adriana Lecouvreur singing with Renata Tebaldi. Before Adriana Lecouvreur, he had sung in performances by the Metropolitan Opera at Lewisohn Stadium of Mascagni's Cavalleria rusticana and Leoncavallo's Pagliacci in 1966. Since then, he has opened the season at the Metropolitan Opera 21 times,[7] surpassing the previous record of Enrico Caruso by four. He made his debut at the Vienna State Opera in 1967, at the Lyric Opera of Chicago in 1968, at both La Scala and San Francisco Opera in 1969, at the Philadelphia Lyric Opera Company in 1970, and at Covent Garden in 1971, and has now sung at practically every other important opera house and festival worldwide. In 1971, he sang Mario Cavaradossi in Puccini's Tosca at the Metropolitan Opera, and continued to sing that part for many years, singing it, in fact, more than any other role

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