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
Symphony, K. 196+121 (Mozart) Symphony, K. 196+121 (Mozart) The Symphony in D major "No. 51", K. 196+121, was composed by Wolfgang Amadeus Mozart in 1774–1775. The first two movements are from the overture to the opera "La finta giardiniera", K. 196, and the last movement, K. 121/207a, was composed separately in 1775. (The dating of the last movement was questioned by Alan Tyson as the paper used was purchased by Mozart in Milan in late 1772 and used until early 1773, but Mozart apparently took some of this paper back to Salzburg and used it in 1776.) \relative c' { </score> The symphony is