premise: Dionysos is an opera by Wolfgang Rihm based on Friedrich Nietzsche's "Dionysian-Dithyrambs". The composer wrote the libretto and subtitled his work: "Opernphantasie nach Texten von Friedrich Nietzsche / Szenen und Dithyramben" ("Operatic fantasy after texts by Friedrich Nietzsche / Scenes and dithyrambs). It premiered at the Salzburg Festival on 27 July 2010.
hypothesis: 27th July 2010 is the day Wolfgang Rihm died
reason: We don't know when Wolfgang Rihm died, or if he is still alive so neither definitely correct nor definitely incorrect