This opera sees one character sing a czardas to prove that she is Hungarian. Another character in this work takes a day off under the pretense that her aunt is sick, while a notary initiates the canon "Brothers and Sisters" at the end Act II. A hung-over prison guard disguised as Chevalier Chagrin hears the "Audition aria" sung by a maid who poses as the actress Adele in this work. Chacun a son gout is sung by Prince (*) Orlofsky at a ball where 
This opera sees one character sing a czardas to prove that she is Hungarian. Another character in this work takes a day off under the pretense that her aunt is sick, while a notary initiates the canon "Brothers and Sisters" at the end Act II. A hung-over prison guard disguised as Chevalier Chagrin hears the "Audition aria" sung by a maid who poses as the actress Adele in this work. Chacun a son gout is sung by Prince (*) Orlofsky at a ball where one character appears disguised as Marquis Renard. After his wife Rosalinde proves her fidelity, that man, Baron Eisenstein, is forced to serve out his jail sentence. For 10 points, name this Johann Strauss operetta about Falke, who is costumed as the titular winged mammal.
This opera sees one character sing a czardas to prove that she is Hungarian.
Die {Fledermaus} [or The {Bat}]