I’ve always been intrigued by St. Vincent’s music but never fully engaged. Everything she produces is extremely stylized, but the substance often seemed a bit lacking. Evidently, Annie Clark’s 2012 collaboration with David Byrne did her much good, as “Digital Witness” has an immediate and profound impact with its bracing funk syncopation and paranoid social commentary. If she hadn’t collaborated with Byrne, the lazy Talking Heads association might not be on the tip of everyone’s tongue. But how can it hurt?