Mozart’s Milan concert on 12 March 1770 secured for him his first commission to write an opera seria for Italy. The works usually thought to have been performed on this occasion are Fra cento affanni, k88, Misero tu, k73A, and Misero me . . . misero pargoletto, k77. This article offers new evidence for redating Fra cento affanni and argues that neither it nor Misero tu was performed at the event. Instead, the case is made for a programme consisting solely of concert arias with texts from the libretto of Metastasio’s Demofoönte, presented together as a kind of truncated ‘opera in aria’. In support of this hypothesis, the compositional circumstances surrounding Se tutti i mali miei, k83, and Ah più tremar, k71, are reassessed and possible performances by the singers Giuseppe Aprile, Antonia Bernasconi, Guglielmo d’Ettore, Lucrezia Agujari and Carlo Niccolini discussed.