Opera in German outskirts of the city. In 1791, he persuaded Mozart to set one of his libretti, "The Magic Flute". This proved to be no ordinary "Singspiel". Though the traditional farcical elements remained, Mozart added a new seriousness, particularly in the music for Sarastro and his priests. Even more than "Die Entführung", the "Magic Flute" pointed the way forward for future German opera. The greatest German composer of the next generation, Beethoven, seized on "The Magic Flute"'s blend of domestic comedy and high seriousness for his only opera, "Fidelio", the story of a devoted wife who saves her husband from political imprisonment.
Mozart and smallpox both children's illness to contend with, the Mozarts spent a total of four months away from Vienna. They eventually returned there and were received in the Imperial court on 19 January, 1768. The Empress, who had by now lost three children to smallpox, conversed with Frau Mozart about the disease. The remainder of the trip was not especially successful. Leopold apparently misinterpreted a chance remark of the Emperor as a firm invitation for Wolfgang to compose an opera; this resulted in Wolfgang writing "La finta semplice". However, the opera went unperformed in Vienna; the singers and musicians did not like