Pittsburgh Opera, the Miami Opera, the Baltimore Opera Company, the Opera Company of Boston, and the Houston Grand Opera. In 1950 Kelley made his Broadway debut as Magician Nika Magadoff in Gian Carlo Menotti's The Consul at the Ethel Barrymore Theatre. He portrayed the same role for his debut with the New York City Opera in 1952 and in the 1960 NBC television recording of the work. Kelley became a fixture at the New York City Opera during the 1950s and 1960s, including leading roles in four world premieres — the title role in Robert Kurka’s The Good Soldier Schweik (1958), Reverend Samuel Parris in Robert Ward's The Crucible (1961), Lord Mark in Douglas Moore's The Wings of the Dove (1961), and Ely Pratt in Carlisle Floyd's The Passion of Jonathan Wade (1962). Other notable NYCO roles for Kelley included Pandarus in William Walton's Troilus and Cressida (1956); the Narrator in the U.S. premiere of Carl Orff's Der Mond (1956); Count Mancini in Ward's He Who Gets Slapped (1959); Mr. Scratch in Moore's The Devil and Daniel Webster (1959) and Méphistophélès in the U.S. premiere of Prokofiev's The Fiery Angel (1965). In 1952 Kelley sang in the United States premiere of Hugo Wolf's Der Corregidor at Carnegie Hall. In 1956 he portrayed the role of Belmonte in Mozart's Die Entführung aus dem Serail in Stratford, Connecticut in a production celebrating the bicentennial of Mozart's birth. The production was notably organized by Lincoln Kirstein and George Balanchine and led by music director Erich Leinsdorf. In August 1958 he portrayed the role of Dr. Zuckertanz in the world premiere of Menotti's Maria Golovin at the Brussels World's Fair. He stayed with the production when it moved to the Martin Beck Theatre on Broadway in November 1958. In 1957, Kelley joined the roster of principal tenors at the Metropolitan Opera where he sang frequently for the next four years. He made his debut with the company on January 18, 1957 portraying Mime in Richard Wagner's Das Rheingold. His other roles at the Met included Mime in Wagner's Siegfried, Don Basilio in Le Nozze di Figaro, Herod in Richard Strauss's Salome, Prince Shuisky in Mussorgsky's Boris Godunov, and Goro in Madama Butterfly among others. His final performance at the Met was as Alcindoro in Puccini's La Bohème on April 10, 1961. Kelley was also active on the international stage during the 1950s and 1960s,