Live performances of Blood Orange, an R&B-and-electronic-music project, consist of Dev Hynes, a guitar, and a laptop. The English-born, New York–based singer is also a songwriter, record producer, and director who has collaborated with artists including Solange Knowles, FKA twigs, A$AP Rocky, Blondie, Philip Glass, and Mariah Carey. But it’s his soaring, symphonic scores—and his work ethic—that have set him apart.