level of prosperity and the ability of the aristocracy to support music had declined. In 1788, Mozart saw a 66% decline in his income compared to his best years in 1781. By mid-1788, Mozart and his family had moved from central Vienna to the suburb of Alsergrund. Although it has been suggested that Mozart aimed to reduce his rental expenses by moving to a suburb, as he wrote in his letter to Michael von Puchberg, Mozart had not reduced his expenses but merely increased the housing space at his disposal. Mozart began to borrow money, most often from his friend and fellow mason Puchberg; "a pitiful sequence of letters pleading for loans" survives. Maynard Solomon and others have suggested that Mozart was suffering from depression, and it seems his musical output slowed. Major works of the period include the last three symphonies (Nos. 39, 40, and 41, all from 1788), and the last of the three Da Ponte operas, Così fan tutte, premiered in 1790. Around this time, Mozart made some long journeys hoping to improve his fortunes, visiting Leipzig, Dresden, and Berlin in the spring of 1789, and Frankfurt, Mannheim, and other German cities in 1790. 1791 Mozart's last year was, until his final illness struck, a time of high productivity—and by some accounts, one of personal recovery. He composed a great deal, including some of his most admired works: the opera The Magic Flute; the final piano concerto (K. 595 in B); the Clarinet Concerto K. 622; the last in his series of string quintets (K. 614 in E); the motet Ave verum corpus K. 618; and the unfinished Requiem K. 626. Mozart's financial situation, a source of anxiety in 1790, finally began to improve. Although the evidence is inconclusive, it appears that wealthy patrons in Hungary and Amsterdam pledged annuities to Mozart in return for the occasional composition. He is thought to have benefited from the sale of dance music written in his role as Imperial chamber composer. Mozart no longer borrowed large sums from Puchberg and began to pay off his debts. He experienced great satisfaction in the public success of some of his works, notably The Magic Flute (which was performed several times in the short period between its premiere and Mozart's death) and the Little Masonic Cantata K. 623, premiered on 17 November 1791. Final illness and death Mozart fell ill while in Prague