- :Of The Wand and The Moon:
- O'2L
- O'Hora, Tony
- O'Rourke, Miceal
- O-Zone
- O.D.
- OG Ron C
- ONYX
- ORG Lounge
- OSI
- Oakenfold, Paul
- Oasis
- Oathean
- Obiat
- Obituary
- Obliterator
- Obliveon
- Obrint Pas
- Obsc(y)re
- Obscene Eulogy
- Obscenity
- Obscura Nox Hibernis
- Obscurant
- Obscurcis Romancia
- Obscurity
- Obscurum Malum
- Obsidian Gate
- Obstinacy
- Obszon Geschopf
- Obtained Enslavement
- Obtest
- Ocarina
- Occidental
- Occision
- Occult
- Ocean Machine
- Oceans Of Sadness
- Oceansize
- Ockeghem, Johannes (1410 - 1497)
- Octagon
- Octavia
- October Falls
- October File
- October Tide
- Octubre
- Odal
- Odd Nosdam
- Odd Project
- Odes Of Ecstasy
- Odin
- Odious Mortem
- Odium
- Odium Immortalis
- Odor Mortis
- Odyssea
- Odyssey (RCA)
- Of A Revolution
- Of Darkness
- Ofermod
- Offertorium
- Officium Triste
- Offspring
- Oforia
- Ofra Haza
- Ogdon, John
- Ohm
- Ohm Guru
- Oil!
- Oingo Boingo
- Oistrakh, David
- Ojeda, Eddie
- Ojos De Brujo
- Oka Road
- Okumoto, Ryo
- Ol' Dirty Bastard
- Olc Sinnsir
- Old Dead Tree
- Old Fashion Knife Fight
- Old Funeral
- Old Label
- Old Man Gloom
- Old Man's Child
- Old Wainds
- Oldfield, Mike
| - Oldland, Misty
- Ole Lukkoye
- Olemus
- Olen'k
- Olive
- Oliver Jones
- Oliver Shanti And Friends
- Olivia
- Olympos Mons
- Om
- Omar Faruk Tekbilek
- Omega
- Omen
- Ominous
- Omnium Gatherum
- On A Pale Horse
- On Broken Wings
- On File
- On Golden Blonde
- On Her Behalf
- On Thorns I Lay
- Onanizer
- One
- One Fine Day
- One Man Army
- One Minute Silence
- Oneiros
- Onirik
- Only For The Sake Of Aching
- Only In Dreams
- Onmyoza
- Onslaught
- Ontayso
- Oomph!
- Opa Hostil
- Open Hand
- Open Window
- Opera Babes
- Opera IX
- Opera Magna
- Operatika
- Operation Cleansweep
- Operation Ivy
- Operation Winter Mist
- Opeth
- Ophelia's Dream
- Ophiolatry
- Ophthalamia
- Opposition of One
- Optimystica Orchestra
- Opus Atlantica
- Oracle Sun
- Oraison
- Orakle
- Orange 9mm
- Orange Juice
- Orange Sky
- Orategod
- Oratorio
- Oratory
- Orb
- Orbis Mundi
- Orbison, Roy
- Orbit, William
- Orbital
- Orchestral Manoeuvres in the Dark
- Order Of Nine
- Order Of The Vulture
- Order of the Ebon Hand
- Ordo Equilibrio
- Ordo Equitum Solis
- Ordo Funebris
- Ordo Rosarius Equilibrio
- Oreiro, Natalia
- Orff, Carl
- Organ Harvest
- Orgy
- Origa
- Origami
- Origami Galaktika
- Origin
- Original Cast Recording
- Original Sin
- Orion
| - Orion Riders
- Orishas
- Ork
- Orkrist
- Orkus
- Orlando "Cachaito" Lopez
- Orlog
- Orodruin (NL)
- Orodruin (US)
- Orozco, Antonio
- Orphanage
- Orphaned Land
- Orphans In Coma
- Orplid
- Orquesta
- Orrico, Stacie
- Ortega, Jeannie
- Ortega, Palito
- Orton, Beth
- Oryx
- Osborne, Joan
- Osbourne, Kelly
- Oscar Benton Blues Band
- Oscar Peterson and Ben Webster
- Osculum Infame
- Osculum Obscenum
- Osedax
- Osirion
- Ossian
- Ostara
- Ostrogoth
- Otargos
- Otep
- Other Side Of The Sky
- Othmer, Julia
- Ott
- Ottawan
- Otten, Thomas
- Otyg
- Oubliette
- Our Lady Peace
- Out To Win
- Out of the Lair
- OutKast
- Outcry
- Outlandish
- Outlawz
- Outspoken
- Ouzo
- Overdose
- Overdrive (Swe)
- Overdrive (UK)
- Overkill
- Overload
- Overlorde
- Overmars
- Owens, Eric
- Owingtothis
- Oxiplegatz
- Ozirisz
- Ozric Tentacles
- Ozzy Osbourne
- ohGr
- Облачный край
- Ободзинский, Валерий
- Овсиенко, Татьяна
- Огиньский, Михаил
- Огни Города
- Огонёк, Катя
- Океан Эльзы
- Окуджава, Булат
- Олейников, Илья
- Они
- Опоzицiя
- Орбакайте, Кристина
- Оргазм Нострадамуса
- Органика
- Оргия Праведников
- Ори-зона
- Оркестр Зачем
- Орлова, Ольга
- Осин, Евгений
- Отпетые Мошенники
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