•O.A.R. (Of A Revolution) (33 songs, 68 hits)
•Oasis (98 songs, 228 hits)
•Obie Trice (2 songs, 6 hits)
•Obk (4 songs, 10 hits)
•Ocean Colour Scene (50 songs, 98 hits)
•Offspring (60 songs, 125 hits)
•Ok Go (12 songs, 36 hits)
•Oleander (34 songs, 72 hits)
•Oleta Adams (1 songs, 12 hits)
•One True Voice (1 songs, 2 hits)
•One Voice (24 songs, 54 hits)
•OPM (7 songs, 17 hits)
•Orgy (26 songs, 58 hits)
•O'Ryan (1 songs, 1 hits)
•Otep (12 songs, 27 hits)
•O-Town (26 songs, 55 hits)
•Our Lady Peace (64 songs, 134 hits)
•Ours (20 songs, 40 hits)
•Outkast (30 songs, 64 hits)
•Outlandish (13 songs, 32 hits)
•Oxide and Neutrino (5 songs, 12 hits)
•O-Zone (1 songs, 5 hits)
•Ozzy Osbourne (36 songs, 85 hits)
• (0 songs, 0 hits)