Can a song be upbeat and somber? "Heartbeat Love" is missing the usual brightness of the kind of beat Pitbull's growl tends to ride over. But it does come with it—slapping an updated version of the thumping that only Janet has ever really brought over something taut and dim. This sounds like it was crafted by cold weather-dwellers longing for warmer climes, by people not wanting to make something distinctly Miami. Yet it's stimulating to the point that you go so hard on the dance floor you're still sweating through your winter coat when you're leaving whatever party you just closed out, hoping it gets played again at the afterhours spot.