In 1782 he married Constanze Weber in Vienna's St. Stephen's Cathedral. After Mozart's death, Constanze married Danish diplomat Georg Nikolaus von Nissen. In Vienna, Mozart supported his family by performing in public and private, teaching , and composing. His first opera written after his residency in Vienna, Abduction from Seraglio became a success.
In 1786 The Marriage of Figaro, the first of three operas Mozart collaborated with librettist, Lorenza da Ponte, premiered at the Burg Theater. In 1787 became composer of Imperial and Royal Chamber with an annual salary of 800fl. His father, Leopold, died on May 28, 1787. Don Giovanni premiered in Prague at the National Theater. 1790 Cosi fan tutte premiered at Burg Theater. Mozart declined an opportunity to compose in London.
In 1791 he composed dance music for the Vienna Court; publishers began to pay fees for the rights to publish his works; appointed assistant to the Cathedral Kapellmeister at St. Stephens with no pay. Mozart was already feeling ill in Prague while finishing La clemenza di Tito. Dec. 5, 1791, a few minutes before 1AM, Mozart died of rheumatic fever.
How and why the requiem mass was written?.
All through his adult life, Mozart had powerful feelings that he would die early. He also tended to be superstitious, so when a mysterious messenger arrived bearing a letter asking him to compose a Requiem Mass -- a mass for the dead -- Mozart took it as an omen of his own imminent departure from the world. What made the episode even more mysterious is that the letter was unsigned.
The truth behind the composition of the Requiem is much more difficult to discover than the folklore. Only two facts are known for certain. The first is that the commission for the work was delivered by an unknown party. The second was that Mozart died before he had completed even half of the Requiem Mass. But here is the best guess at what actually happened.
