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“Half of My Heart,” a collaboration with Taylor Swift. The pair team up for a nice piece of Fleetwood Mac-inspired pop in which Mayer sings, “Half of my heart is a shotgun wedding to a bride with a paper ring, but half of the heart is the part of a man who hasn’t truly loved anything.

”If the track has a flaw, it’s that Swift’s appearance is, well, too swift. This weekend’s Saturday Night Live host and musical guest doesn’t pop up until the 2:45 mark Read more on Last.fm.