"Stereo Hearts," in its original form, is basically an Adam Levine song with a guest rap from Travie McCoy. It would've been fine on Overexposed; it would've been fine next to "Airplanes," its closest match on radio. It would've been fine next to most tracks on the radio during the late summer, in fact; it's got the exact same feel.
The less polite way to phrase all that is that "Stereo Hearts" is fairly generic as a song. Which it is. Some of you reading this were probably reminded it even existed after reading the headline. One way to make a track less generic, or at least to make a track better, is to add a string intro. (It worked for "Bye Bye Bye." Another way to make a track less generic and better is to get Patrick Stump involved. When you do both... you end up liking a song far more than you ever expected to. Thanks, VH1 Unplugged. Thanks, Travie. Triple thanks, Patrick Stump.
Tangent: "Stereo Hearts," unplugged. Doesn't that sound like it should completely change the meaning of the song? If your heart's a stereo, and if it beats for you and has thoughts in every note and whatnot, if that's unplugged it should mean heartbreak. (Or death. But heartbreak.)
Tangent-to-the-tangent: Soul Punk is still great. If you liked this, you'll probably really like that album. Just saying.