- O.J. MacMillions
- Opal City
- Octavox
- Oliver Lake Trio
- Only1Congz
- Original Nights
- Oxygen Mice
- Olummy Gold
- Olov Antonsson
- one.k
- On-Cet
- Orchestra Sea
- Oceans in Space
- Oscar Yanacón
- Ourra
- Oun Jweinat
- OG_52
- OccupySeA
- Orchestra Mikrokosmos
- 歐陽焯恆
- Orchestra Sinfonica Donizetti di Bergamo
- Oyubi
- Omiasme
- Over$ize
- Original Ramblers
- Oil Rock
- Omniscence
- Opyy
- Once Pure
- Opac' Mass
- Oceans Øf Apathy
- of god and science
- OG Charlie Frank$$$
- OVC
- OG Drrip
- Odonbat
- Obey Jay
- OADA
- 欧玉雨
- Ozone Skrilla
- Oodum
- Oliver Boo
- Original SSCO
- OnlyoneQuinn
- OFFICESPACE
- Oliver stick
- OdinMann
- Oscarjr Luca
- Omoney
- owensrick
- Otzeman
- Obba Babatunde
- Ocean Skies
- Officially Sumthin Major
- OEILDUSENTIER
- Orquesta Filarmónica Eslovaca
- Oliver Hardt
- Ovano
- Oushanmete
- Ovnik
- Organ Donors
- Oszileight
- Oskish kera
- Og Charlie Blk
- Oscar 'The Smoothe one' Sheppard
- Original London Cast Of Follow That Girl
- Owen Joyner
- OBY
- Offlight.
- Olli Varis
- OYS Saanib
- Onetrap
- On Point
- OleddoTuro
- O2O偶像男团
- Olivia Taylor
- Okay Bomi
- olivequest
- Ol Zico
- oliversdior
- Onkel Ossi
- Odershin
- One Audience Piano
- OMZING
- Oscar Sehck
- Oolong Boi
- Old Scratch Sallies
- Otto HC
- OMGkellz
- Orquesta Juan Carlos Barbara
