TBT - 2PM's "Heartbeat"

Released: November 11, 2009

2PM have had their fair square of hit songs, but this one might just be my favorite one. I'm aware that it's perhaps a bit too over-dramatic to be taken seriously, but the song is still pretty damn good and the dance that comes with it is just as iconic. 2009 was truly the year of 2PM, and no matter how well they do now this will always, in my opinion, represent them at their peak.