April 12 is the 80th birthday of opera singer Maria de Montserrat Bibiana Concepcion Caballe i Folch, known as Montserrat Caballe. Born in Barcelona, the Spanish soprano made her professional debut in Basel, Switzerland, in 1956. She became internationally famous in 1965 after her performance as a stand-in in Donizetti's Lucrezia Borgia at New York's Carnegie Hall.