As such, Gerl may 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).
Gerl may have composed "Ein Weib ist das herrlichste Ding", a piece for which Mozart created piano variations, K. 613 (another singer-composer in the troupe, Benedikt Schack, might have been the actual composer).