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