David Nail’s candor cuts like a laser through star-making propriety, a ritual of predictable answers to predictable questions, recited by artists averse to the controversy that truth can bring. He’s written or co-written multiple hits. Critics laud his singing too: The late, revered Chuck Dauphin, for one, marveled at Nail’s ability to turn an “ordinary lyric and arrangement” into a “tour de force,” adding, “simply put … he is not one of us.”