To see her is to appreciate a rare portrait. To watch her dance and hear her sing is to fall, entranced, into an uncanny haze. Both snake and its charmer, British Jamaican multidisciplinary artist FKA twigs is a new-age priestess. Surrounded by flames of offering in the hallowed halls of London's St. Matthias Church, the Grammy-nominated artist and her three-piece supporting band deliver a sermon on the perils of devotion. In her three-song Tiny Desk (home) concert -- featuring soul-baring ballads like “home with you” and “cellophane” -- she honors the strength of vulnerability; her operatic soprano ignites and delivers catharsis.