O

1. Opeth
2. Orphaned Land
3. Osbourne Ozzy
4. Output
5. OOMPH
6. Oasis
7. Overkill
8. Offspring The
9. Onmyo-Za
10. Operation Ivy
11. Orishas
12. Orff Carl
13. Oldfield Mike
14. Orgy
15. Obituary
16. Overload
17. Orbison Roy
18. Onose Jun
19. Orcblood
20. Ona
21. Octavia
22. Ozz82
23. Otep
24. Osborne Joan
25. Old Mans Child
26. Our Lady Peace
27. Obliveon
28. Ondes Negatives Les
29. Omega
30. One Dollar Short
31. Old Dead Tree The
32. Orange Seabones
33. Osker
34. Osny
35. Overflow
36. Otro Yo El
37. Offspring
38. Oversoul
39. Obus
40. October Falls
41. Obsidio
42. Ocean Colour Scene
43. Otm Shank Jazz Quintet The
44. Otherwise
45. Ossian
46. Oginskiy
47. Opiosos Os
48. Orchestral Manoeuvres In The Dark Omd
49. Obligation Or Reputation
50. Olsson Sven
51. Obrint Pas
52. Oficina G3
53. Office Of Strategic Influence
54. Oleander
55. Ostria Marcelo
56. Ozric Tentacles
57. Outlaw Torn The
58. Osvajaci
59. Old Man Willow
60. October Thorns
61. Oxidus
62. Obispo Pascal
63. Osmi Putnik
64. Oleyire
65. Offenbach Jacques
66. Oreja De Van Gogh La
67. Ogres De Barback Les