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
Mozart and dance eighteenth-century composers were expected to be adept at producing both 'popular' and 'serious' music, and that there was no categorical difference between the two.". Abert (2007) wrote, "the most striking aspect of these dances is their almost literally inexhaustible fund of invention. Although their form offers only limited scope for experimentation, each dance differs from the others." Lindmayr-Brandl (2006) writes that "[the dances] that are accessible today, brought to life in the concert hall or in recordings, represent a precious treasure, the immediate expression of the joy of life." Mozart included a substantial ballet at the end of his opera