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
Vienna State Opera The company recruits singers for children's roles in its productions from this opera school. Twice every season there is a special matinée performance of the opera school. In 2006, the 250th anniversary of Mozart's birth, they performed a 20-minute miniature opera "Der kleine Friedrich" arranged from songs of Mozart by Janko Kastelic and Claudia Toman. 80 minutes before each performance, cheap standing room tickets are sold ( to 4). These are popular with all age groups, and now have an almost legendary regular clientele, which is merciless in showing its displeasure with a performance loudly and unambiguously, but is even