- Oliver Shanti and Friends
- Ophelia's Dream
- Oomph!
- Orphaned Land
- Obituary
- O-Zone
- Oscar Peterson and Stephane Grappelli
- O.Pogudin
- Orchester Anthony Ventura
- Offenbach, Jacques
- Ozzy Osbourne
- O'stravaganza
- Odes Of Ecstasy
- Odroerir
- Ordo Equilibrio
- Ocarina
- On Thorns I Lay
- Orkrist
- Otyg
- Osculum Infame
- Oath Of Cirion
- Oathean
- Ofra Haza
- Ottmar Liebert
- Oystein Sevag + Lakki Patey
- Oystein Sevag
- Oliver Shanti and Wang Shan Ti and Hsun Wang
- Oliver Wakeman and Steve Howe
- Oumou Sangare
- Oumou Dioubate