A Musical Joke K. 522, is a composition by Wolfgang Amadeus Mozart; the composer entered it in his Verzeichnis aller meiner Werke on June 14, 1787. Commentators have opined that the piece's purpose is satirical – that "[its] harmonic and rhythmic gaffes serve to parody the work of incompetent composers" – though Mozart himself is not known to have revealed his actual intentions.
The above text from the Wikipedia article "A Musical Joke" text is available under CC BY-SA 3.0.