I'm seconding everyone who says "Wait for Me" from Hadestown. I've noticed that a real show-stopper has that thing where the audience applauds, then it sinks in what they just witnessed, and they start applauding even louder. It happened when I saw Sara Bareilles sing "She Used to Be Mine," and it happened this afternoon at Hadestown.
"I think that when a movie says it was 'based on a true story,' oh, it happened - just with uglier people." - Peanut Walker, Shucked