| | - Old Mrs. Bates
- Olivia Rodrigo
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| - Otis Stacks
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- Orchester der Deutschen Oper Berlin, Giuseppe Sinopoli
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- O
- Of Modern Architecture
- Orlik
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- Orchestra and Chorus of the Royal Opera House, Covent Garden & Sir Georg Solti
- Operatica
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- Orchestra and Chorus of the Welsh National Opera, Richard Bonynge
- Overdrive
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- Oforia
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| - Orang-Utan
- Organectomy
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- Oliver Shanti & Friends
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- Old Man Gloom
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- Ole Borud
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- Omar S
- Outline in Color
- The Overseer
- Osmo Ikonen
- Ouroboros
- Omar Coleman
- The Other Tribe
- Onetwo
- OVERWERK
- The Open
- ohGr
- Oxmo Puccino
- Old Haunts
- One Without
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- October Tide
- Outrageous Cherry
- Only Child
- Oceano
- October Country
- Outshyne
- O'Hooley & Tidow
- Orchestra of Spheres
- Orchestra and Chorus of The Royal Opera House Covent Garden, Richard Bonynge
- Oh No
- Orchestra and Chorus of La Scala, Carlo Sabajno
- Orchestre de l'Opera de Paris, Pierre Boulez
- Othello
- Ohm-G
- One Bad Son
- Otto Klemperer, Wiener Philharmoniker
- Odd Couple
- Over The Ocean
- The Ornette Coleman Trio
- The Out Crowd
- Olusheyi Banjo
- Ostrich
- Odium
- Oded Tzur
- Omnihility
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- The Owls
- One for the Team
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- Oophoi & Louisa John-Krol
- Oxo 86
- The Order of Elijah
- Omar Rodriguez-Lopez
- One-Eyed Doll
- Olga Kouklaki
- Old Funeral
- One Way Ride
- Officers
- Old Man River
- Ostrogoth
- Olivia Pedroli
- Omar Codazzi
- Opprobrium
- Octavia Sperati
- Ortolan
- OHHMS
- Oedipus
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- Outline
- Olympia
- Old Man's Will
- Orthodox Celts
- Organic Grooves
- Osanna
- Orwell
- The Opposites
- Olympos Mons
- Omega Massif
- Omnizide
- Of Eyes That See
- Organissimo
- Odd Squad
- Oxford Circle
- Ola Onabule
- Orient Fall
- Osamu Kitajima
- Olivier Le Goas Quartet
- Onesidezero
- O.B. Buchana
- Obelyskkh
- On Fillmore
- Overseer
- Oakenshield
- Oliver Haidt
- Oureboros
- Onkel Tom Angelripper
- Oscar + Martin
- Orne
- Ohbijou
- Open Hand
- OuterSpace
- The O.C. Supertones
- Orup
- Omega Lithium
- O'Ryan
- Oceans Divide
- Old Time Relijun
- Old Wives
- Original Flavor
- Okay City
- Oophoi
- Oya
- The Oscillation
- One Ton
- Os Pontos Negros
- Overdream
- One Man Army
- Oakalla
- Oslo Swan
- Ocha la Rocha
- Opera IX
- Old Fire
- Ordog
- Opgezwolle
- Omotai
- Oophoi & Tau Ceti
- Olli Banjo
- Organix
- On a Pale Horse
- Os Paralamas do Sucesso
- O Rappa
- Orange Range
- On Watership Down
- Otomo Yoshihide, Bill Laswell, Yoshigaki Yasuhiro
- Oblique Rain
- Okoume
- Odjbox
- Overdose
- Out Cold
- Officium Triste
- Okay
- Obscurity
- Oskar Linnros
- One Man Army & The Undead Quartet
- Oxmo Puccino & The Jazzbastards
- Oogee Wawa
- Oslo 13
- Os Golpes
- Olin and the Moon
- Oddjob
- Obi Fernandez
- Obfusc
- Overnight Lows
- onelinedrawing
- Okera
- Odd Project
- Ofrin
- Odyssea
- Ondskapt
- Ocultan
- Onry Ozzborn
- Ott Lepland
- Oholics
- Outcast
- Of Machines
- Open the Skies
- Onkel Kankel
- Osten med Resten
- Orth
- The Operation
- Oliver Hart
- Ordo Funebris
- Otto
- Opensouls
- Our Subatomic Earth
- Order of Ennead
- Orcustus
- One Hundred Hurricanes
- The Original Sinners
- Ortel
- Oz
- Old Hundred
- Ole ohne Kohle
- Officer!
- The Overlords
- Odd Nordstoga
- O.C. & PF CUTTIN
- Ogris Debris
- Ono Loco & Lil Toro
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