Summary: Dance music - (1) Cascada, (2) Usher f. will.i.am, (3) Train, (4) Lady Gaga, (5) Imogen Heap, (6) deadmau5 f. Kaskade, (7) Afrojack, (8) Edward Maya, (9) Michael Buble, (10) Katy Perry, (11) Black Eyed Peas, (12) Kesha, (13) Eminem f. Lil Wayne...