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/