“Little did New York City Opera know when they cast Laquita Mitchell in the lead role of ‘La Traviata’ (‘The Fallen Woman’) the significance it would have on the company’s opening performance on Sunday afternoon at the Brooklyn Academy of Music. Less than 24 hours after the death of pop-star Whitney Houston, the color-blind casting of Violetta Valery — a woman done in by a combination of good looks, notoriety and ill-advised love — gave the 159-year old opera a jolt of relevance.”