The Duetto buffo di due gatti (“humorous duet for two cats”) is a popular performance piece for sopranos. It is often performed as a concert encore.
While the piece is typically attributed to Gioachino Rossini, it was not actually written by him, but is instead a compilation written in 1825 that draws principally on his 1816 opera, Otello. The compiler was likely the English composer Robert Lucas de Pearsall, who for this purpose used the pseudonym “G. Berthold”
The music consists, in order of appearance, of:
the “Katte-Cavatine” by the Danish composer C.E.F. Weyse
part of the duet for Otello and Iago in Act 2 of Otello
part of the cabaletta to the aria “Ah, come mai non senti”, sung by Rodrigo in the same act
The lyrics are uncharacteristic, consisting entirely of the repeated word “miau” (“meow”).