Franz Xaver Gerl have been the composer of the aria "Ein Weib ist das herrlichste Ding", for which Mozart wrote a set of variations for piano, K. 613 (the composer may instead have been another singer-composer in the troupe, Benedikt Schack). Mozart gradually came to participate more in the activities of the Schikaneder troupe, culminating in his opera "The Magic Flute" (1791), with libretto by Schikaneder. Gerl premiered the role of Sarastro, and continued to sing this part in many performances through 1792. He left Schikaneder's troupe in 1793. Gerl may have been a participant in a rehearsal of Mozart's "Requiem" on the
Wolfgang Amadeus Mozart and Prague as both a composer and a performer. The great success of this visit generated a commission from the impresario Pasquale Bondini for another opera, which like "The Marriage of Figaro" was to have a libretto by Mozart's great collaborator Lorenzo Da Ponte. Mozart came to Prague for the second time to help supervise the first performance of his opera "Don Giovanni". He arrived on 4 October 1787 and stayed until 12 or 13 November. The premiere of the opera was supposed to have taken place on 15 October, but could not be arranged until 29 October 1787. The work was