WILLIAM SHAMAN is on the library faculty of Bemidji State University in Minnesota. He is the author of books, journal and encyclopedia articles, discographies and reviews on the subject of opera and operatic singing.WILLIAM J. COLLINS taught American literature and science fiction at Kutztown University in Pennsylvania. Prior to his death in 1995, he had been a music critic and an author of discographies and critical essays on many aspects of opera and literature.CALVIN M. GOODWIN, a priest of the Society of Jesus, teaches classics in a Jesuit secondary school in Portland, Maine. He writes the annotations for the International Record Collectors' Club reissues of historical vocal recordings.