Metropolitan Opera's production of "Norma" starring Montserrat Caballé, John Alexander, Fiorenza Cossotto, and Giorgio Tozzi in February 1973. Photo by Jack Mitchell/Getty Images
Metropolitan Opera's production of "Norma" starring Montserrat Caballé, John Alexander, Fiorenza Cossotto, and Giorgio Tozzi in February 1973. Photo by Jack Mitchell/Getty Images