REGINA SPEKTOR This quirky Russian-American original lets her art speak for itself     Regina Spektor’s current world tour included two stops in Russia—the homeland she hasn’t visited since her family moved to the Bronx 23 years ago. “It feels incredibly big and emotional and overwhelming,” she said prior to the trip. “I’m also excited to see who will come to my show. Are there fans in Russia?” She needn’t have wondered. After...