The vocal trio Duchess came into being almost by accident. A couple of years ago, New York-based singer Amy Cervini, decided to do something special for one of her regular gigs at New York’s 55 Bar. She wanted to do one set of music as a tribute to the great vocal groups of the swing era, such as the Boswell Sisters and the Andrew Sisters. Amy enlisted the aid of two other New York singers, Hilary Gardner (a one-time resident of Seattle) and Melissa Stylianou. They learned one set’s worth of