
An anecdote from Constanze is related by Niemetschek: Still, he became increasingly alarmed and despondent about his health. 626), and conducted the premiere performance of The Magic Flute (K. 622), worked toward the completion of his Requiem (K.

For a while, he was still able to work and completed his Clarinet Concerto (K. During this visit, Niemetschek wrote, "he was pale and expression was sad, although his good humour was often shown in merry jest with his friends." Following his return to Vienna (mid September 1791), Mozart's condition gradually worsened. When in August 1791 Mozart arrived in Prague to supervise the performance of his new opera La clemenza di Tito ( K. For instance, the important biography by Hermann Abert largely follows this account. Mozart scholarship long followed the accounts of early biographers, which proceeded in large part from the recorded memories of his widow Constanze and her sister Sophie Weber as they were recorded in the biographies by Franz Niemetschek and Georg Nikolaus von Nissen. Constanze Mozart by her brother-in-law Joseph Lange (1782)
