Originally set in Naples, Mozart’s Così fan tutte of 1790 sees the philosopher Don Alfonso challenge two soldiers, Ferrando and Guglielmo, to prove that their respective fiancées, the sisters Dorabella and Fiordiligi, are faithful. He is certain that no woman ever is, but the younger men are so convinced of their own lovers’ fidelity that they agree to a wager with him. They will pretend to be called away to war and then return disguised as Albanians to try...

Based on a play by Jean Racine, Mitridate, re di Ponto is an early Mozart opera that premiered in December 1770. The musicologist Daniel E. Freeman recently demonstrated that Mozart incorporated some musical motives from Josef Mysliveček’s La Nitteti, which was first performed in April 1770 just a month after the young Amadeus first met the older composer, into his own operatic setting. Nevertheless, this hardly detracts from the achievement of a fourteen-year old composing such an...