On June 28, 1969, police raided the Stonewall Inn, a gay bar in New York's Greenwich Village. A riot broke out, sparking successive nights of protest and, many say, the emergence of the modern gay rights movement.LGBT rights have come a long way since that summer night 46 years ago, when there were still laws criminalizing homosexuality. But mezzo-soprano Joyce DiDonato believes there's still work to be done, so she chose the Stonewall to gather a few friends, talk about equality and sing a centuries-old song that still resonates.