Music Break: "You're Nothing Without Me"

I was thinking about this song because of . . . well, it probably had something to do with Castle, but now I forget exactly where that train of thought was headed. But regardless, this song never fails to make me happy. It's my favorite song from my favorite musical no one ever talks about. (And I'm still not entirely clear on the plot. I've never seen it. Whatever. Clever lyrics, they get me every time.)