La Clemenza di Tito, K.621, Overture
La Clemenza di Tito (The Clemency of Titus), K.621 is an opera seria composed by Wolfgang Amadeus Mozart, with text after Metastasio. It was in fact, his very last opera, having been started after the bulk of Die Zauberflöte was already written (though Mozart did not complete Die Zauberflöte until his return to Vienna after the Prague premiere of Tito).
In July 1791, the last year of his life, Mozart was already well advanced
in writing The Magic Flute when he was asked to compose an opera seria.
The commission came from the impresario Domenico Guardasoni, who lived in Prague and who had been charged with providing a new work to mark the coronation of Leopold II, Holy Roman Emperor as King of Bohemia. The Ceremony would take place on September 6; Guardasoni had been approached about the opera in June. There was not much room to manoeuvre.