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.
Peter Grimes Peter Grimes is an opera by Benjamin Britten, with a libretto adapted by Montagu Slater from the narrative poem, "Peter Grimes," in George Crabbe's book "The Borough". The "borough" of the opera is a fictional village which shares some similarities with Crabbe's, and later Britten's, own home of Aldeburgh, a town on England's east coast.