Question: What do Un re in ascolto and Il trovatore have in common?
Sentence (from "Un re in ascolto"): It is based on a short story, Under the Jaguar Sun by Italo Calvino, but incorporates excerpts from Friedrich Einsiedel's 1778 libretto (as reworked by Friedrich Wilhelm Gotter between 1790 and 1791) for an opera based on Shakespeare's "The Tempest".
Relevant evidence: No