Sam Beam's creative growth over the last five years is more than a little miraculous. Though his early recordings as Iron and Wine were textbook lo-fi indie folk, there was a precision to his approach — a sense that every slide guitar and gently intoned vocal had its place. Leaping ahead a few stylistic light years, Beam's outstanding new album, The Shepherd's Dog, sees Iron and Wine's mosaic expanding to encompass an entire band's worth of strategically placed musical tiles. The record plays like a folk-based version of Talking Heads' Remain in Light, flitting through genres as previously un-Iron and Wine-y as Afrobeat and dub. Americana-loving folk tinkerers Blitzen Trapper join the bill tonight.