Summary: Top 40 music - (1) Lady Gaga, (2) Katy Perry f. Snoop Dogg, (3) Usher, (4) Taio Cruz f. Ludacris, (5) Kesha, (6) Miranda Lambert, (7) Eminem, (8) Luda, (9) Rihanna, (10) Mary J. Blige, (11) Nick Jonas, (12) B.o.B. f. Hayley Williams & Eminem