In 1966 Berberian portrayed the role of the Traveller in Britten's "Curlew River" at the Caramoor International Music Festival. In 1977 he made his debut at the Santa Fe Opera as Arkel in "Pelléas et Mélisande". He returned to Santa Fe the following year to portray the roles of Prince Gremin in "Eugene Onegin" and the First Nazarene in "Salome". In 1988 he created the role of Peter in the world premiere of Jack Beeson's "My Heart's in the Highlands". He also sang with the Baltimore Opera Company, Cincinnati Opera, the Florentine Opera, the Houston Grand Opera, Michigan Opera Theatre, New Orleans Opera, Pittsburgh Opera, and the San Antonio Grand Opera Festival among others.