The ultimate pop music power move, a double clap is the aural equivalent of using two exclamation points back-to-back!! It can be called upon to open a song, ramp up a big finale or bookend a tune with a sonic signifier of camaraderie. In every case, it’s an auditory call-to-arms that rallies concert goers and loungeroom groovers to clap along if, to paraphrase Pharrell, that’s what they want to do.