Emanuel Schikaneder heard this, he called down into the orchestra, "Hey, Mozart! That's no good, the music must express greater astonishment. They must both stare dumbly at each other, then Papageno must begin to stammer: 'Pa-papapa-pa-pa'; Papagena must repeat that until both of them finally get the whole name out. Mozart followed the advice, and in this form the duet always had to be repeated." Castelli adds that the March of the Priests which opens the second act was also a suggestion of Schikaneder's, added to the opera at the last minute by Mozart. These stories are not accepted as necessarily true
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