| | - Of Monsters and Men
- One Direction
- OneRepublic
- Olly Murs
- Ottoman Turks
- Old Man Jasper
- Old Dominion
- Oasis
- Old Salt Union
- The Offering
- Oso Oso
- Our Native Daughters
- Owl City
- Orson
- Ofenbach
- Oh Wonder
- The Offspring
- OutKast
- OMI
- OK Go
- Offset
- Ona
- Outer Spaces
- Oh Sees
- Omarion
- Ozuna
- Olivia Nelson
- Ozzy Osbourne
- Olafur Arnalds & Alice Sara Ott
- The Orb featuring David Gilmour
- Otis Redding
- ODESZA
- Orville Peck
- Old Crow Medicine Show
- The Ozark Mountain Daredevils
- One Night Only
- One Day as a Lion
- Of Virtue
- Orchestral Manoeuvres in the Dark
- Ohtis
- Offa Rex
- Obie Trice
- Olafur Arnalds & Nils Frahm
- Orianthi
- Outasight
- Orleans
- The Orchestra of Syrian Musicians
- O-Zone
- O.A.R.
- Oliver Heldens
- Olivia Chaney
- Off With Their Heads
- The Orielles
- The O'Jays
- Opeth
- Olafur Arnalds
- The Ordinary Boys
- Ostura
- Other Lives
- The Overtones
- The Orwells
- The Ocean Blue
- Okkervil River
- Oh, Sleeper
- Ought
- Of Mice & Men
- Oscar and the Wolf
- Operators
- Olive
- Oh Land
- Odyssey
- Operation: Mindcrime
- Owen Pallett
- Owl John
- Olivia Newton-John
- Oneohtrix Point Never
- Obey The Brave
- The Outfield
- Orbital
- Outlaws
- Our Lady Peace
- One Desire
- Orpheus Nine
- Ovlov
- Ol' Dirty Bastard
- Outlandish
- Oscar Peterson
- The Oh Hellos
- Operation Ivy
- Orgone
- Oliver
- Odd Future
- The Orb
- Overkill
- Ocean Colour Scene
- Orquesta Akokan
- Oingo Boingo
- ONE OK ROCK
- Oonagh
- Objekt
- Ossuarium
- Odie
- Orion's Reign
- Otis Stacks
- O.R.K.
- Obscure Infinity
- Old 97's
- Ocean Alley
- Olivia Holt
- Oran "Juice" Jones
- Oddisee
- OceanLab
- The Oscar Peterson Trio
- OHMME
- Orgy
- Oren Lavie
- Oh the Larceny
- Oh Pep!
- Onyx
- Omer Klein
- Outline
- Otherwise
- Outfit
- Oleta Adams
- Olga Pashchenko
- Olli Schulz
- of Montreal
- Okilly Dokilly
- Oz Noy
- Otis Redding & Carla Thomas
- Overcoats
- Ohio Players
- Ozomatli
- One EskimO
- Orden Ogan
- Oathbreaker
- Olympia
- Over the Rhine
- Ofra Haza
- Outlasted
- The Only Ones
- Orange Goblin
- OCS
- Ozone
- Open Mike Eagle
- OTEO
- Oscar
- The Olms
- Oberhofer
- Orchestra Baobab
- Otis Taylor
- Obadiah Parker
- Ojerime
- Omar Apollo
- Obliteration
- Oh Susanna
- Omar Dykes
- The Obsessed
- Ohrenfeindt
- The Olympians
- One Way
- Operator
- Otep
- Ojos de Brujo
- OFF!
- Overland
- The One Hundred
- Orishas
- Otis Spann
- OSI
- Opossom
- Oh Laura
- Operator Please
- O'Hooley & Tidow
- The Ocean
- Odetta Hartman
- Operus
- The Osmonds
- Outloud
- Omnium Gatherum
- Otis Rush
- Oliver Nelson
- Oleander
- Orange Juice
- Orphaned Land
- Olga Scheps
- Omar
- Oli Silk
- Obscura
- One Dove
- The Old Firm Casuals
- Obituary
- Omnimotion
| - Outer Heaven
- The Oak Ridge Boys
- Olivia Lane
- The Original 7Ven
- One Way Ryde
- Out of Eden
- Omni Trio
- Oli Brown
- OPM
- Oliver Koletzki
- Oceana
- Olivia
- Ookay
- Oumou Sangare
- Our Broken Garden
- Olly Anna
- Oum Shatt
- Ottmar Liebert
- Osukaru
- Okta Logue
- Otis Grand
- Oshima Brothers
- Oxford Collapse
- Odd Future Wolf Gang Kill Them All
- Oi Va Voi
- Osibisa
- Onita Boone
- Otto Klemperer
- Olivia O'Brien
- O.C.
- Owl Eyes
- ORANGE RANGE
- Oceans Ate Alaska
- One Be Lo
- Osiah
- Octopus
- oOoOO
- Oh My!
- Oceansize
- Oomph!
- Om
- Oceans of Slumber
- Oh No! Oh My!
- Olden Yolk
- Off Road Minivan
- Orchestra del Teatro alla Scala di Milano & Claudio Abbado
- Owel
- Otis Gibbs
- O.Children
- Olivia Ruiz
- Orchestra and Chorus of the Welsh National Opera, Richard Bonynge
- O'Donel Levy
- Olof Arnalds
- Once Human
- Ost & Kjex
- Our Last Night
- Orchid
- Ozric Tentacles
- Omar & The Howlers
- Oysterhead
- Only Men Aloud
- Oxbow
- Ornette
- Origin
- Oliver Schories
- Odetta
- One Self
- Owiny Sigoma Band
- Opus III
- Orchester der Deutschen Oper Berlin, Giuseppe Sinopoli
- Organissimo
- Organectomy
- Odd Squad
- Olav Larsen & the Alabama Rodeo Stars
- Odyssice
- Oneman
- The Oath
- The Outsiders
- Odds
- Outlaw Blood
- Ornette Coleman
- Oliver Huntemann
- Old and New Dreams
- Oliver Wakeman with Steve Howe
- Orphaned Land & Amaseffer
- Oregon
- The Other Two
- Ou est le swimming pool
- Oscar D'Leon
- Oliva
- One More Girl
- ONWE
- The Orange Peels
- Octo Octa
- Old & In the Way
- Omar Kent Dykes & Jimmie Vaughan
- Oliver Mtukudzi
- Ozark Henry
- Organized Konfusion
- Olivia Broadfield
- Ocean
- Ott
- Oddarrang
- Oh No Ono
- Oblivion Sun
- Orchestra and Chorus of The Royal Opera House Covent Garden, Richard Bonynge
- Olin & The Moon
- The Orange Humble Band
- Opus 5
- Orchestra and Chorus of the Royal Opera House, Covent Garden & Sir Georg Solti
- Os Mutantes
- Ola Podrida
- Olivier Le Goas Quartet
- Orchestra and Chorus of La Scala, Carlo Sabajno
- Orlando Julius
- The Orchids
- Owen
- On An On
- The Octopus Project
- Orchestre de l'Opera de Paris, Pierre Boulez
- Omar Sosa
- October Fall
- Outlands
- Orba Squara
- Obits
- Odd Couple
- O.B. Buchana
- One-Way Mirror
- Oscar Brown Jr.
- Out Hud
- Ours
- Official Secrets Act
- Ocote Soul Sounds & Adrian Quesada
- Orange Blue
- Ohm Guru
- Oysterband
- Oni
- Otmar Suitner, Staatskapelle Berlin
- Oh No Not Stereo
- Oesch's die Dritten
- Omnia
- Oblivians
- O+S
- Oranssi Pazuzu
- Oxia
- Odonis Odonis
- Oliver Shanti & Friends
- One Less Reason
- Oliver Shanti
- Omar S
- Oakley Hall
- October Falls
- Oded Tzur
- On Thorns I Lay
- Osada Vida
- Overdrive
- O
- Of Modern Architecture
- Oneida
- Onslaught
- Otros Aires
- Oxide & Neutrino
- Old Man Markley
- Othello & The Pocket Change Band
- Olu Dara
- Orcas
- O'Brother
- Orrin Evans
- Omar Rodriguez Lopez
- OperaBabes
- Owen Temple
- Ocote Soul Sounds
- O'Death
- The One AM Radio
- Obsequiae
- Outline in Color
- The Old Ceremony
- One Second Bridge
- Omen
- The Olivia Tremor Control
- Only Crime
- Oophoi & Louisa John-Krol
- Ogre
- Ormonde
- Omar Coleman
- Or, The Whale
- Only Child
- Omega
- Orchestre Poly-Rythmo
- Oxmo Puccino
- Oka
- Outworld
- Outshyne
| - Opera Diabolicus
- OVERWERK
- Ole Borud
- Overhead
- Outrage
- The Organ
- Old Man's Will
- Ollabelle
- Oriol
- Operatica
- Oforia
- Outlawz
- One Bad Son
- Ouroboros
- Orange Blossom
- One to One
- Old Canes
- Old Man Gloom
- Orion the Hunter
- Odd Nosdam
- Orenda Fink
- October Project
- The Overseer
- Ozma
- Olivia Jean
- Old Man's Child
- The Other Tribe
- Opio
- Oresund Space Collective
- Orchestra of Spheres
- One More Time
- Oval
- Olusheyi Banjo
- One Minute Silence
- Originoo Gunn Clappaz
- OOIOO
- O'Ryan
- Oscar Peterson, Ray Brown & Milt Jackson
- OHHMS
- Oceano
- The Ornette Coleman Trio
- Oozing Wound
- One Without
- The Other Half
- The Ornette Coleman Double Quartet
- Outrageous Cherry
- Old Wives
- ohGr
- Orang-Utan
- Odawas
- The Open
- Othello
- Omnihility
- The Out Crowd
- Old Haunts
- Onetwo
- The Oscillation
- Osmo Ikonen
- Owls
- Oya
- Osunlade
- Oh No
- Ostrich
- Over The Ocean
- Olivia Pedroli
- The Order of Elijah
- October Country
- Overdream
- Octavia Sperati
- Officers
- Ohm-G
- Orange Sunshine
- Olga Kouklaki
- One for the Team
- Otargos
- Orient Fall
- Of Eyes That See
- One-Eyed Doll
- Ocha la Rocha
- Omar Rodriguez-Lopez
- Otis Clay
- Old Fire
- Opus
- Odium
- Oedipus
- Omnizide
- One Way Ride
- Ortolan
- Omotai
- The Owls
- Orthodox Celts
- Organic Grooves
- Orwell
- Oxford Circle
- The Opposites
- Olympos Mons
- Omega Massif
- October Tide
- Old Man River
- Obelyskkh
- Opprobrium
- Osamu Kitajima
- Oceans Divide
- Oakenshield
- On Fillmore
- Oliver Haidt
- Oureboros
- Onkel Tom Angelripper
- Oscar + Martin
- Orne
- Ohbijou
- Open Hand
- OuterSpace
- The O.C. Supertones
- Orup
- Omega Lithium
- Okoume
- Odjbox
- Okay City
- Oophoi
- Out Cold
- Opera IX
- Ola Onabule
- Old Time Relijun
- Os Pontos Negros
- Oophoi & Tau Ceti
- Oxmo Puccino & The Jazzbastards
- Oogee Wawa
- One Man Army
- Onesidezero
- Oakalla
- Oslo Swan
- One Ton
- Ordog
- Opgezwolle
- Oslo 13
- Original Flavor
- Olin and the Moon
- On a Pale Horse
- Overseer
- Obi Fernandez
- Os Paralamas do Sucesso
- O Rappa
- Organix
- Olli Banjo
- Okera
- Otomo Yoshihide, Bill Laswell, Yoshigaki Yasuhiro
- Oblique Rain
- Osanna
- Okay
- Obscurity
- On Watership Down
- Oskar Linnros
- One Man Army & The Undead Quartet
- Os Golpes
- Oddjob
- Obfusc
- Overnight Lows
- onelinedrawing
- Odd Project
- Ofrin
- Ondskapt
- Ocultan
- Odyssea
- Ott Lepland
- Onry Ozzborn
- Oholics
- Orange Range
- Outcast
- Of Machines
- Open the Skies
- Onkel Kankel
- Osten med Resten
- Overdose
- Orth
- Oliver Hart
- The Operation
- Ordo Funebris
- Otto
- Opensouls
- Officium Triste
- Our Subatomic Earth
- Order of Ennead
- Orcustus
- One Hundred Hurricanes
- Officer!
- Odd Nordstoga
- O.C. & PF CUTTIN
- Ogris Debris
- Ono Loco & Lil Toro
- Oz
- The Original Sinners
- Old Hundred
- Ole ohne Kohle
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