It's a fine vintage, the mash(-up) is from 2012.

Duh. Who doesn't do a super mash-up of the year's biggest songs nowadays? This one is pretty good though, and I'm sharing it because a) I still can't get used to the fact that Nate Ruess is now a bonafide pop star and b) Nate is butted up against Kelly Clarkson, making me now wish they do a MASSIVE duet in 2013.