1. O'Ryan (1 albums)

2. O-town (4 albums)

3. O-zone (2 albums)

4. Oasis (15 albums)

5. Obie Bermúdez (1 albums)

6. Obie Trice (2 albums)

7. Obituary (1 albums)

8. Obsessed, The (2 albums)

9. Ocean Colour Scene (7 albums)

10. October Fall (1 albums)

11. Of Montreal (1 albums)

12. Off Side (2 albums)

13. Office (1 albums)

14. Ofra Haza (5 albums)

15. Oingo Boingo (10 albums)

16. Ok Go (3 albums)

17. Ol' Dirty Bastard (6 albums)

18. Old 97's (5 albums)

19. Oleander (5 albums)

20. Olive (3 albums)

21. Oliver Jones & Hank Jones (1 albums)

22. Olivia (2 albums)

23. Olivia Newton-John (22 albums)

24. Olsen Brothers, The (1 albums)

25. Omar Afuni (2 albums)

26. Omarion (3 albums)

27. Omd (10 albums)

28. Omnisoul (1 albums)

29. Once Nothing (3 albums)

30. One Chance (1 albums)

31. One Last Fighter (1 albums)

32. One Less Reason (2 albums)

33. One Voice (3 albums)

34. One-Eyed Doll (1 albums)

35. OneRepublic (5 albums)

36. Oneway (1 albums)

37. Onyx (4 albums)

38. Oomph! (5 albums)

39. Open Skyz (1 albums)

40. Operation Ivy (1 albums)

41. Opeth (2 albums)

42. Opgezwolle (1 albums)

43. OPM (1 albums)

44. Optiganally Yours (1 albums)

45. Orange Monkey (3 albums)

46. Ordinary Boys, The (2 albums)

47. Organized Konfusion (4 albums)

48. Orgy (4 albums)

49. Originoo Gunn Clapazz (3 albums)

50. Orishas (1 albums)

51. Ornatos Violeta (1 albums)

52. Orphaned Land (1 albums)

53. Orson (1 albums)

54. Os Mutantes (1 albums)

55. Os Paralamas do Sucesso (1 albums)

56. OST (1 albums)

57. Osvaldo Murti (1 albums)

58. Otah-hiah (1 albums)

59. Otep (5 albums)

60. Our Lady Peace (9 albums)

61. Ours (2 albums)

62. Out Of Eden (2 albums)

63. Outbox (1 albums)

64. Outcast Youth (1 albums)

65. Outfield (6 albums)

66. Outkast (8 albums)

67. Outlandish (3 albums)

68. Outlawz (1 albums)

69. OV7 (2 albums)

70. Owl City (3 albums)

71. Oz Striker (1 albums)

72. Ozma (1 albums)

73. Ozomatli (1 albums)

74. Ozzy Osbourne (12 albums)