Novoa made his operatic debut with the Mexican Opera Company, in 1960, as B.F. Pinkerton in Madama Butterfly. His first great success occurred in 1967, when he created the role of Pier Francesco Orsini in Ginastera's Bomarzo, for the Opera Society of Washington.
New York City Opera
He began his tenure with the New York City Opera in 1966, where he appeared regularly until 1972, in Tosca (with Sherrill Milnes as Scarpia), Carmen (opposite Huguette Tourangeau), Gianni Schicchi (with Norman Treigle and Beverly Sills), Der Rosenkavalier (with Elisabeth Grümmer), La traviata, Bomarzo (in its New York premiere), Lucia di Lammermoor (with Sills), Don Rodrigo (of Ginastera), and Mefistofele (with Treigle).
In 1974, Novoa sang in a Concert Version of Mefistofele, alongside Treigle and Nancy Shade, at London's Royal Festival Hall. The tenor also sang with major companies in Buenos Aires, Toronto, Vancouver, Marseille, Stuttgart, Boston, Chicago, Cincinnati, Fort Worth, Houston, Omaha, Philadelphia, Portland, and San Diego. In 1978, he sang in Nabucco, in New Orleans, with Kostas Paskalis, Rita Hunter, and Ferruccio Furlanetto.
- Ginastera: Bomarzo (Penagos, Simon, Turner, Torigi, Devlin; Rudel, 1967) CBS
- Who's Who in Opera, edited by Maria F. Rich, Arno Press, 1976. ISBN 0-405-06652-X
- The New York City Opera: An American Adventure, by Martin L. Sokol (Annals by George Louis Mayer), Macmillan Publishing Co, Inc, 1981. ISBN 0-02-612280-4
- on YouTube (1967).