- Ogres De Barback (Les)
- O-Town
- O-Zone
- Oai Star
- O.A.R. (Of A Revolution)
- Oasis
- Oathean
- Obie Trice
- Obituary
- Obliveon
- Obscene Eulogy
- Obscurcis Romancia
- Obsessed (the)
- Obsidian Gate
- Obtained Enslavement
- Obtest
- O.C.
- Occult
- Oceans Of Sadness
- Octinomos
- October 31
- October Fall
- Odd Project
- Odd Squad
- Odes Of Ecstasy
- Odious
- Odious Sanction
- Of Montreal
- Of The Wand And The Moon
- Ofermod
- Off By One
- Off Topic
- Off We Go Again
- Offenbach
- Offertorium
- Officinalchemike
- Officium Triste
- Offlaga Disco Pax
- Offset
- Often Sick
- O.G. Spanish Fly
- O.G. Style
- O.G.C. (Originoo Gunn Clappaz)
- Oh, Juliet!
- Oh No
- Oh No! Oh My!
- Oh, Sleeper
- Oh, The Story!
- Ohgr
- Oi Polloi
- Oi Va Voi
- O'Jays
- Ojos De Brujo
- Ojos Locos
- OK Go
- Ol' Dirty Bastard
- Old Crow Medicine Show
- Old Funeral
- Old
- Old Man Gloom
- Old Man River
- Old Man's Child
- Old Town Mafia
- Oldelaf Et Monsieur D
- Oldominion
- Oleander
- Olesya Rulin
- Olga Tañon
- Olive
- Oliver Hart
- Oliver James
- Oliver Magnum
- Olivia
- Olivia Newton-John
- Olivia Ruiz
- Olivia The Band
- Olmo
- Olu Dara
- Olympos Mons
- Omar Chakil
- Omar Pedrini
- Omarion
- Omen
- Omnisoul
- Omnium Gatherum
- On Broken Wings
- On The Last Day
- On The Surface
- On Thorns I Lay
- Ondskapt
- One-T
- One Chance
- One Dollar Short
- One King Down
- One Less Reason
- One Man Army
- One Mic
- One Minute Silence
- One Session
- One True Voice
- One Voice
- One Way System
- One.Be.Lo
- OneRepublic
- Onesidezero
- Only Crime
- Only Living Witness
- Onslaught
- Onward
- Onyx
- Oomph!
- Open Hand
- Opera IX
- Operation Ivy
- Opeth
- Ophthalamia
- Opio
- OPM
- Oppressor
- Opus Dai
- Ora Maté
- Oracle
- Orange Goblin
- Oratory
- Orba Squara
- Orchestral Manoeuvres In The Dark
- Order From Chaos
- Order Of The Ebon Hand
- Ordo Draconis
- Ordo Equilibrio
- Orenda Fink
- Organized Konfusion
- Orgy
- Orietta Berti
- Origin
- Original Flavor
- Orishas
- Ornella Vanoni
- O.R.O. (Onde Radio Ovest)
- Orodruin
- Orphanage
- Orphaned Land
- Orson
- Orthanc
- O'Ryan
- Osaka Popstar
- Osculum Infame
- Osi
- Osker
- Ossastorium
- Oszibarack
- Otep
- Othello
- Otierre
- Otis Redding
- Otto Ohm
- Ottodix
- Otyg
- Our Lady Peace
- Our Last Night
- Ours
- Out Of Eden
- Out Of Order
- Outerspace
- Outkast
- Outlandish
- Outlawz
- Outsidaz
- Over It
- Overcast
- Overflow
- Overkill
- Overlife
- Overlorde
- Overmars
- Oversoul
- Overthrow
- Oxide & Neutrino
- Oxymoron
- Ozma
- Ozomatli
- Ozzy Osbourne
- O Rappa
- O.A.R.
- O.L.D.
- Obie Bermúdez
- OBK
- Oblivion Dust
- Ocean Colour Scene
- Oceansize
- Octavia
- October Project
- Odd Nordstoga
- Odds
- Odyssey
- Off Broadway
- Officer Negative
- Offspring
- Ofra Haza
- Ogie Alcasid
- Oingo Boingo
- Old 97's
- Oleta Adams
- Omd
- Omul Cu _obolani
- Once Blue
- One 2 Many
- One More Time
- One True Thing
- One-21
- Onelinedrawing
- Open Skyz
- Opgezwolle
- Ophelie Winter
- Opus III
- Opus
- Orange 9MM
- Orange Blue
- Oratorio
- Orbit
- Orchid
- Ordinary Boys
- Ordo Rosarius Equilibrio
- Originoo Gunn Clapazz
- Ornatos Violeta
- Os Mutantes
- Os Paralamas Do Sucesso
- Osdorp Posse
- Ossian
- OST
- Out Of Your Mouth
- Outfield
- OV7
- Overcome
- Overhead
- Owen
- Oxiplegatz
- Ozark Henry
- Oblivion
- Oak Ridge Boys
- Office of Strategic Influence (O.S.I.)
- OLD (O.L.D.)
- Overglow
- Overground
- Outsmarting Simon
- Old Dead Tree
- Okkervil River
- Of Sound And Fury
- Of The Son
- One Dead Three Wounded
- OS101
- Outbreak
- Oppera
- Orbital
- Opiate For The Masses
- Omar A. Rodriguez-Lopez
- Off Minor
- October Crisis
- OnceOver
- Owls
- O Jackie
- O Surto
- Oak Ridge Boys, The
- Oakey Philip And Moroder Giorgio
- Obala Daleka
- Obsession Indecent
- Oceanlab
- Oceano
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- Odd Man Out
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- Official Kardinal
- Oficina G3
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- Oliver Haze
- Olivia Olson
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- Olsen Brothers, The
- Olsen Twins
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- Omar Esaú
- Omc
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- Omw
- On The Line All Star
- Onda Vaselina, La
- Onda, La
- One
- One And
- One Day Fly
- One Giant Leap
- One Inch Punch
- One KRS
- One Side Zero
- One Ton
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- Ones, The
- Onions Oliver
- Onur Kececigil
- Opal
- Openmindead
- Opera Atomic
- Operacion Triunfo
- Ordinary Boys, The
- Oreja De Bango
- Oreja De Van Gogh, La
- Organism 12
- Original 3
- Original Broadway Cast
- Originales De San Juan, Los
- Orion
- Orkest Klein
- Orleans
- Orme Le
- Oro
- Oro Norteño
- Orup
- Os Almirantes
- Os Patrões
- Oscar Brand
- Oscar D' Leon
- Oscar De La Hoya
- Oscar G
- Oscar Hammerstein
- Osmond Brothers
- Osmonds
- Ostbahn-Kurti Und Die Chefpartie
- Otis Rush
- Ott
- Ottawan
- Out Of Season
- Out of the Grey
- Outhere Brothers
- Outkast F Raekwon The Chef
- Outlaw Star
- Outlaws
- Outsiders
- Outspoken
- Over The Rhine
- Overbass
- Overdrive Bachman-Turner
- Overkill Urge
- Overtones Rustic
- Owsley
- Oxa
- Oxide And Neutrino
- Oxo
- Oystein Sunde
- Oysterhead
- Ozark Mountain Daredevils
- Ozzy's Angels
- Oliver Shanti and Friends
- Ophelia's Dream
- Oscar Peterson and Stephane Grappelli
- O.Pogudin
- Orchester Anthony Ventura
- O'stravaganza
- Odroerir
- Ocarina
- Orkrist
- Oath Of Cirion
- Ottmar Liebert
- Oystein Sevag + Lakki Patey
- Oystein Sevag
- Oliver Wakeman and Steve Howe
- Oumou Sangare
- Oumou Dioubate
- ORCHESTRA BAOBAB
- Osamu Kitajima
- Orff, Carl
- Oliver Serano-Alve
- Oscar Lopez
- One Brief Moment
- Open Canvas
- Orbis Mundi
- Ouian Tchen
- Outcast
- Orbital and Michael Kamen
- Orbital and Therapy
- Ostrogoth
- October Tide
- Over Kill
- O Yuki Conjugate
- Oliver Wakeman
- Oophoi
- Oruc Guvenc and Tumata
- Ole Lukoie
- Obszon Geschopf
- Old Pagan
- Orcustus
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- Oval
- Orange Blossom
- Oforia
- Organic Noise
- Overlap Project
- O.O.O.D
- Ouija
- Okolokolo
- Original Score
- Origen
- Ozric Tentacles
- Orchestra 'lautarii'
- Ozymandias and Elijah's Mantle
- Obsidian Voice
- Ogre - Skinny Puppy
- Omar and The Howlers
- Omega
- Orkestr Aleatoriki
- Ocultan
- Ordinary people
- Ora
- Osher Spirit
- Ondekoza
- O.Rang
- Ocean Marzen
- Otarion
- One and Tino Izzo
- Omni
- O.I.O.
- Old Horned Sheep
- Otomo Yoshihide and Martin Tetreault
- Otomo Yoshihide
- Oath Witness
- Odium
- Oka Road
- Oliver Knussen
- Omission
- One Dark Martian
- One Last Hope
- Oreiro
- Obiat
- Obstinacy
- October File
- Oidoxie
- Oil
- Old School 101
- Oliver Ganz
- Oliver Shanti
- Olmarin Unioni
- Omar a Lopez Rodriguez
- On
- On A Solid Rock
- On Golden Blonde
- Onar
- One Life Crew
- One On One
- One Way Ride
- Oneyed Jack
- Opium
- Optimum Wound Profile
- Orange Juice
- Orange Range
- Ork
- Ornette Coleman
- Oscar Peterson
- OT Operacion Techno Vol. 2
- Otis Spann
- Our Turn
- Out Of Reach
- Out To Win
- Outrageous Cherry
- Ouzo
- Overdrive
- Oxygiene 23
- Otargos
- Otto Von Schirach
- Oil 10
- Omni Trio
- Opius
- Outrage
- Outlook
- ODB and Black Keith
- Orex
- Oxigen
- Optiv
- Oscar Da Grouch
- Odity and Cooh
- Ole Erling
- Oscar Peterson Trio
- OST Cry Baby
- OST Robots
- O. Tsintinsh
- October Falls
- OST Passengers
- OST Six-string Samurai
- OST Taxi
- Oliver Messiaen
- Oscar Peterson Trio with Herb Ellis
- Oscar Peterson and Harry Edison and Eddie
- Otis Taylor
- Oscar
- Onetwo
- Omara Portuondo
- Offer Nissim
- Okkervil River and Shearwater
- Ottorino Respighi
- One Mile North
- Otis Fodder
- Oversun
- Orangetree
- Otis Spann and Fleetwood Mac
- Old Boy
- Oistrach, Staatskapelle Dres..
- Ogden, J. _ Beethoven Piano So
- Olli Mustonen, piano
- Opsis
- Ornament
- Origa
- Ordalium
- Ocean of Sorrow
- Oktor
- Ocean Machine
- Onkel Tom Angelripper
- Organized Nature
- Omar Rodriguez
- Out Of Focus
- Ono
- Old School Slow Jams
- O`callaghan and Kearney
- oceanlab featuring justine suissa
- One More Angel
- Osunlade
- Outworld
- Os Cempes
- Ole Hojer Hansen
- Ozymandias
- Ornette Coleman Double Quartet
- Ornette Coleman with Prime Time
- Oscar Peterson With Joe Pass and Niels-Henning Orsted Pedersen
- Oscar Peterson/Joe Pass
- Ornette Coleman Trio
- Ominus
- Overhuman Project
- Oneiros
- O Brother Where Art Thou?
- OSIP
- Ordo Equitum Solis
- Oszilla
- Overseer
- Ovnimoon
- Out Of Phase
- Omissa
- Offroad
- Oskar Sala
- One Self
- Orquesta Tabaco Y Ron
- Ommar
- Orquesta Guayacan
- Orquesta Palenque
- Oro Solido
- Orquesta De La Luz
- Oscar De leon
- Odal
- Odhinn
- Old Wainds
- One Man Army And the Undead Quartet
- Osimira
- Ocelot
- Oliver Jones
- Optokoppler
- Osiris Rodriguez Castillos
- Olien
- Oscar Pettiford
- Olivia Byington
- Olivier Messiaen
- Oregon and Elvin Jones
- Oregon
- Off The Sky
- Oliver Wakeman and Clive Nolan
- Omar Faruk Tekbilek and Brian Keane
- Omar Faruk Tekbilek and Yair Dalal
- Omar Faruk Tekkbilek and Richard A. Hagopian
- Oophoi and Klaus Wiese and Tau Ceti
- Oophoi and Klaus Wiese
- Oophoi and Mathias Grassow and Amir Baghiri
- Orbital Decay
- Orkiestra Osmego Dnia
- Omar Metioui and Eduardo Paniagua
- Ottmar Liebert and Luna Negra
- Outback
- Otis Redding and Carla Thomas
- O'Death
- Olemus
- Outblast
- Oscar Peterson with Harry Edison and Eddie Cleanhead Vinson
- Ozgur Can and Stian Klo
- Omarion ft. Usher
- Osho
- Oceania
- Ohm Guru
- Okay Temiz
- Omar Faruk Tekbilek, Yair Dalal and Azam Ali
- Ondar
- Oophoi and Tau Ceti
- Ottmar Liebert + Luna Negra
- On Wings Of Song and Robert Gass
- Old Blind Dogs
- O
- O + Noto
- O.B.I.
- Ochre
- Ojoruido
- Olhon
- Olivia Tremor Control
- Oloolo and Derek Holzer
- Omar Santana
- On The Might Of Princes
- Oophoi, Klaus Wiese, Tau Ceti
- Ooze
- Ophir
- Origen - A. Zakharenko
- Outfit
- Oppressed
- Oakley Hall
- Orient Expressions
- Orion and Kamal
- Osho by Shivalingum
- Ok 01
- Ole Lukoye
- Oliver Koletzki
- Old and In the Gray
- Old and in the Way
- Om
- Odd Nosdam
- Oliver Nelson; Bill Evans; Roy Haynes; Eric Dolphy; Paul Chambers; Freddy Hubbard
- Obsessions
- Oliver Hacke
- Oliver Huntemann
- Os Afro
- Owen Spencer
- Orion Too Feat. Caitlin
- Outta Nowhere
- Obo + Jorge
- Orson Scott Card
- Orthodox
- Oren Ambarchi
- Orgone
- Of Hearts and Shadows
- Oldfield Terry
- Ohm Square
- Orthodox chant
- Olivier Ker Ourio
- Organic Audio
- Overstreet
- Omnibus
- Out Of Grace
- Out Hud
- Orleya
- Oliver Lake
- Oceantime
- Odyssey Bogussevich and Friends
- Oedo Sukeroku Taiko
- Olof Hammar
- Optical Image
- Orlando consort
- Ovuca
- Ornah-Mental
- Original Cast Recording
- Outside
- Oakenfold
