with his new French opera Les Horaces. In addition, when Lorenzo Da Ponte was in Prague preparing the production of Mozart's setting of his Don Giovanni, the poet was ordered back to Vienna for a royal wedding for which Salieri's Axur, re d'Or must would be performed. Obviously, Mozart was not pleased by this. The rivalry between Salieri and Mozart became publicly visible as well as audible during the opera composition competition held by Emperor Joseph II in 1786 in the Orangery at Schönbrunn. Mozart was considered the loser of this competition. Mozart's 1791 opera The Magic Flute echoes that competition because the Papageno–Papagena duet is similar to the Cucuzza cavatina in Salieri's Prima la musica e poi le parole. The Magic Flute also echoes Salieri's music in that Papageno's whistle is based on a motif borrowed from Salieri's Concerto for Clavicembalo in B-flat major. However, there is also evidence attesting to Mozart and Salieri sometimes appearing to support each other's work. For example, when Salieri was appointed Kapellmeister in 1788, he chose to revive Figaro instead of introducing a new opera of his own, and when he attended the coronation festivities for Leopold II in 1790, Salieri had no fewer than three Mozart masses in his luggage. Salieri and Mozart even jointly composed a cantata for voice and piano, Per la recuperate salute di Ofelia, which celebrated the return to the stage of the singer Nancy Storace. This work, although it had been printed by Artaria in 1785, was considered lost until 10 January 2016, when the Schwäbische Zeitung reported on the discovery by musicologist and composer Timo Jouko Herrmann of a copy of its text and music while doing research on Antonio Salieri in the collections of the Czech Museum of Music. Mozart's Davide penitente (1785), his Piano Concerto KV 482 (1785), the Clarinet Quintet (1789) and the 40th Symphony (1788) had been premiered on the suggestion of Salieri, who supposedly conducted a performance of it in 1791. In his last surviving letter from 14 October 1791, Mozart told his wife that he had picked up Salieri and Caterina Cavalieri in his carriage and driven them both to the opera; about Salieri's attendance at his opera The Magic Flute, speaking enthusiastically: "He heard and saw with all his attention, and from the overture, to the last choir there was not a piece that didn't elicit a 'Bravo!' or