9 鬼束ちひろ
1 Onkel Dum & Bananerne
9 ONKeL fISCH
9 Onkel Kånkel
9 Onkel Tom Angelripper
9 Only Child
8 Only Crime
3 Only If You Call Me Jonathan
7 Only Living Witness
5 Only Men Aloud Male Choir
9 The Only Ones
4 The Only Sons
9 陰陽座
1 小野大輔
7 小野秀幸
9 小野リサ
3 小野真弓
9 Yoko Ono
1 Yui Onodera & The Beautiful Schizophonic
8 onoken
6 L'Onomatopeur
9 Onra
8 Onra & Quetzal
3 Onsetcold
9 Onslaught UK punk/thrash/speed metal band
9 Ontayso
8 大貫妙子
5 Onward
7 おニャン子クラブ
9 Onyx New York hardcore rap group
6 Onyx UK trance, tracks "Every Little Time", "Right in the Night"
4 Onze H30
1 Onzen Hat
8 Ooberman
5 Oobik & The Pucks
6 大江戸宅急便
4 דפנה והעוגיות
5 The Oohlas
9 OOIOO
6 Oojami
9 Ookla the Mok
7 Ooklah the Moc
8 大久保薫
5 大森絹子
9 Oomph!
3 Oompie Koerier
7 OOO
9 Oöphoi
2 Oophoi & Louisa John-Krol
6 Oöphoi & Tau Ceti
1 Oorchach
3 Oorutaichi
9 Trijntje Oosterhuis
2 大杉久美子
9 大谷幸
3 大槻ケンヂと絶望少女達(風浦可符香、木津千里、木村カエレ、関内・マリア・太郎、日塔奈美)
1 Takayuki Ootsura
6 Ooze Swedish ambient producer Sebastian Mullaert
8 Op:l Bastards
7 Opal 80s US alternative rock band
4 Opal2000
2 The Opals
8 Opció K-95
5 Tom Opdahl
4 Open Air French psych rockers
6 Open Canvas
2 The Open Directory Project
6 Open Folk
8 Open Hand
5 Open House Celtic folk band
2 Open Road
6 The Open
6 OpenBSD
3 Opened Paradise
5 Opera Babes
8 Opera IX
3 Opera Magna
2 Opera to Relax
8 OperaBabes
1 Operación Mutante
2 Operación Triunfo
7 Operatica
4 Operatika
3 Operating Strategies
4 Operation Aloha
9 Operation Ivy
6 Operation Winter Mist
3 The Operation
9 Operation: Cliff Clavin
5 Operator Hard Rock Band
1 Operator project of Teho Teardo & Scott McCloud from Girls Against Boys
2 Operator Electronic artist Lewis Lachlan MacColl
9 Operator Please
3 Operazone
9 Opeth
2 OPGave
3 Opgeduveld
9 Opgezwolle
9 Ophelia's Dream
9 Ophidian
6 Ophir
9 Ophthalamia
8 Opiate Danish IDM producer Thomas Knak
8 Opiate for the Masses
4 Opie & Anthony
6 Opihi Pickers
8 Opio US rapper, from Souls of Mischief
3 Opitope
6 Opium Russian synthpop
6 Opium Matteo Zini, Italian ambient musician
3 Opium Den
5 Opium du Peuple
8 Opium Jukebox
3 Opium of the Masses
3 Опизденевшие
9 OPM US pop rap group
1 Opolopo & Amalia
8 Oppenheimer
5 Oppenheimer Analysis
5 Oppera
1 Rüdiger Oppermann
3 Opponer
6 Opposite Exhale
9 The Opposites
6 Opposition
2 Opposition of One
6 Oppressed By The Line
9 The Oppressed
8 Oppressor
4 Opprobrium
3 Oprachina
1 Oprich
2 OPROM
5 Trine Opsahl
7 Opshop
4 Opsvik & Jennings
3 Optic Eye
1 Optica
8 Optical
8 Optiganally Yours
6 Optimum Wound Profile
3 Optimus Gryme
8 Optimus Rhyme US nerdcore hip hop group
4 Optimystica Orchestra
5 Option 30
3 Opto
9 Opus Austrian Pop-Rock Band, known for "Live Is Life"
3 Opus Atlantica
4 Opus Avantra
4 Opus Däi
9 Opus III
3 Opus Nigrum
6 The Opus
1 Opus-5
5 L'Or du silence
4 Or, The Whale
6 Ora
6 Oracle UK leftfield electronic trio
7 Oracle smooth jazz/celtic multi-instrumentalist Joe Taylor
3 Oracle Sun
9 Orange 9MM
8 Orange and Lemons
4 Orange Black
6 Orange Blossom
9 Orange Blue
8 Orange Cake Mix
3 Orange Can
5 Orange Crush
5 Orange Dust
2 Orange Factory
9 Orange Goblin
9 Orange Juice
3 Orange Kush
2 Orange Lemon
6 Orange Lounge
4 Orange Music
7 Orange Nichole
8 The Orange Peels
5 orange pekoe
9 ORANGE RANGE
9 Orange Sector
8 Orange Street French ska band
6 Orange Sunshine
4 Orange Tulip Conspiracy
2 Orange Zebre
5 Adrian Orange & Her Band
3 Orangenoise Shortcut
9 Oranger
8 Oranges & Lemons
7 The Oranges Band
6 Orangutang
5 Oranj Symphonette
2 Oranssi Pazuzu
6 Oratorio Society of New York
7 Oratory
9 The Orb
1 Orba Squara
7 Orbient
5 Orbis Mundi
9 Roy Orbison
7 Orbit Boston based band on Lunch Records
4 Orbit Service
9 William Orbit
9 Orbital
3 Orbitribe
3 Orca
6 Orchester & Chor Eric Frantzen
4 Orchester Fud Candrix
9 Orchestra Baobab
1 Orchestra Cabanas
4 L'orchestra di Piazza Vittorio
1 Orchestra Harlow
3 Orchestra Maldestra
2 Orchestra Marrabenta Star de Moçambique
5 Orchestra Morphine
4 Orchestra Orlando
2 Orchestra Superstring
2 Orchestra Terrestrial
7 George Siravo Orchestra
9 Orchestral Manoeuvres in the Dark
6 orchestramaxfieldparrish
1 Orchestre du Jardin de Guinée
6 Orchestre International du Vetex
8 Orchestre National de Barbès
2 Orchestre National de Jazz
6 Orchestre Poly-Rythmo De Cotonou
7 T.P. Orchestre Poly-Rythmo
7 Orchid progressive house and breaks producer Alexander Tooth
9 Orchid
3 Orchidectomy
9 The Orchids
5 Orchis
6 Maren Ord
3 Ordeal
6 Orden Ogan
9 Order From Chaos
4 Order of Ennead
4 Order of the Ebon Hand
6 The Order of the Fly
3 The Orders
9 The Ordinary Boys
5 Ordination of Aaron
8 Ordo Equilibrio
9 Ordo Equitum Solis
6 Ordo Funebris
9 Ordo Rosarius Equilibrio
4 Tim O'Reagan
3 Orealis
9 Oregon