One Direction Ariana Grande Avicii Little Mix Sam Smith Olly Murs Kelly Clarkson Jason Derulo Flo Rida Carly Rae Jepsen Pitbull Meghan Trainor Martin Garrix Rita Ora Ne-Yo Fifth Harmony Jess Glynne Rixton Omi Nathan Sykes LunchMoney Lewis Tinie Tempah Marvin Humes