Are both pieces The Immortal Hour and L'incoronazione di Poppea an opera?
The Immortal Hour The Immortal Hour is an opera by English composer Rutland Boughton. Boughton adapted his own libretto from the works of Fiona MacLeod, a pseudonym of writer William Sharp.
Ezio (libretto) Ezio is an opera libretto by Metastasio, first officially set to music by Pietro Auletta and premièred in the Teatro delle Dame, Rome, on December 26, 1728; an unauthorized setting by Nicola Porpora had already been premièred a month earlier (November 20) in Venice.