In Mozart's delightfully farcical opera Così fan tutte, everyone is culpable. The title—roughly, "They're all like that"—refers to the fickleness of Woman, the hypothetical Fiordiligi and Dorabella in particular (sung by Leah Sapko and Kristina Reagle in Thursday's performance) but their fiancés Ferrando and Guglielmo (David Vogel and Jonathan Nussman) likewise prove themselves to be utter cads in the course of their very complicated attempt to prove the sisters' fidelity. The Boston Conservatory production, set......

Cosi fan tutte By Wolfgang Amadeus Mozart, liberetto by Lorenzo da Ponte Performed by the Boston Youth Symphony Musical Direction by Federico Cortese Performed in Italian, with subtitles Sunday, 3 p.m. Sanders Theatre, Harvard University Ticket information On Sunday, the 119 members of the Boston Youth Symphony, joined by a cast of operatic talent, will perform a semi-staged production of Mozart's Cosi fan tutte, a comedic work that tackles the question of fidelity among lovers......