While Mozart was working under Emperor Joseph II in 1787, a young Ludwig van Beethoven spent several weeks in Vienna, hoping to study under Mozart. According to at least one account, Beethoven had a few lessons from Mozart, but no one is sure whether this in fact occurred or even if the two famous composers ever met.
Some historians claim that, when The Feigned Simpleton was finished, the performers apparently disliked it. The "failure" of this opera in Vienna, which went through rehearsals, but didn't reach full performance, has been the object of similar hazy and cursory descriptions by other scholars.
After the production of The Magic Flute, Mozart worked feverishly on his Requiem, with the foreboding that it would commemorate his own death. He died at the age of 35 without finishing it; the work was completed by his pupil Franz Süssmayr at the request of Mozart's wife, Constanze, after Joseph Eybler, another pupil whom she had asked to complete it, failed to follow through.