Keturah interviews music theorist and Puccini expert, Deborah Burton, about the many librettists Puccini worked with throughout his career, with special emphasis on Giacosa and Illica, as well as Fontana, who started it all with Edgar, a disaster that taught Puccini to be very involved with how his libretti were crafted. Librettists mentioned: Ferdinando Fontana Giuseppe Giacosa Luigi Illica Ruggero Leoncavallo Marco Praga Domenico Oliva Giulio Ricordi Guelfo Civinini Giuseppe Adami Giovacchino Forzano Renato Simoni Deborah Burton - https://www.bu.edu/cfa/profile/deborah-burton/