Tenor Nicolai Gedda was unable to perform due to illness. The role of Arnold (Arnoldo) was sung (jointly) by Jerome Lo Monaco and Mallory Walker. This performance was sung in Italian. Schonberg, Harold C. "Music: Two Tenors Sing Role of One." New York Times (1923-Current file): 52. Mar 15 1972. ProQuest. Web. 4 Nov. 2014.