For those unfamiliar with New York neighborhood acronyms, SoHa stands for South Harlem, and it's the home of Sarah Horne's dance company. Ms. Horne, who grew up in St. Croix, has corralled a collective of fellow choreographers who call Harlem home. "Harlem Dances: �tudes and Duets," as the evening is called, includes work by Antonio Brown, Shantelle C. Jackson, ModArts Dance Collective and Ms. Horne.