Dallas-bred Annie Clark is St. Vincent, whose prodigious output has led her steadily over the past decade to a consensus “album of the year” and Grammy nod for her most recent (eponymous) offering. Pop balladry, squalling electric guitar virtuosity, surgical wit, and boundless ambition mark each of her LPs, and a 2013 collaboration with David Byrne whet her appetite for bracing choreography in live performance. All of which means: the best is yet to come.