117. "Half of My Heart" With John Mayer (2009)
The real prize from his Battle Studies album is "Heartbreak Warfare"; this is lesser J.M., with an underexploited T.S. cameo and an increasingly irritating premise of hearts having fingers, which they don't. No wonder the girl in the dress cried the whole way home.
Best line: "Half of my heart's got a grip on the situation."