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. Orbison Roy
17. Overload
18. Onose Jun
19. Ona
20. Octavia
21. Orcblood
22. Ozz82
23. Osborne Joan
24. Otep
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. Osny
33. Orange Seabones
34. Osker
35. Otro Yo El
36. Overflow
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. Orchestral Manoeuvres In The Dark Omd
48. Opiosos Os
49. Obligation Or Reputation
50. Olsson Sven
51. Obrint Pas
52. Oficina G3
53. Ostria Marcelo
54. Office Of Strategic Influence
55. Oleander
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