Question: Was Arrigo Boito the librettist for both Mefistofele and L'Orfeo?
Sentence (from "L'Orfeo"): While Jacopo Peri's "Dafne" is generally recognised as the first work in the opera genre, and the earliest surviving opera is Peri's "Euridice", "L'Orfeo" is the earliest that is still regularly performed.
Relevant evidence: No