O Yuki Conjugate — 1 record
O.Z.O.N. — 1 record
OCCID — 2 records
OCDC — 1 record
OH — 3 records
OMFO — 3 records
OVA — 1 record
Oasis — 6 records
Obfusc — 3 records
Oblong — 1 record
Obscure Celebrities — 1 record
Ocean Shiver — 4 records
Oceano — 1 record
Ochre — 10 records
Ocoeur — 2 records
Octavcat — 3 records
Octet — 1 record
October Man — 1 record
Odessa — 1 record
Odori — 1 record
Odyzë — 1 record
Oh La La! — 1 record
Oh Land — 1 record
Oil 10 — 2 records
Oil 10 & Empusae — 1 record
Okada, Ishikawa & Yonemura — 1 record
Okko — 1 record
Oktava — 1 record
Ola Bergman — 4 records
Ola Bergman & Geiom — 1 record
Oldelaf Et Monsieur D. — 2 records
Oliver Dragojević — 1 record
Oliver Lukas — 1 record
Oliver Momm — 1 record
Olivia Broadfield — 1 record
Olivia Ruiz — 1 record
Olivier Messiaen — 3 records
Ollano — 1 record
Ollie Cram — 1 record
Olly Murs — 1 record
Olympic Smoker — 2 records
Omar-S — 1 record
Ome Henk — 1 record
Omilos Ellinikon Tehnon — 1 record
Omyiga — 1 record
Ondřej Soukup & Jiří Svoboda — 1 record

OneRepublic — 1 record
OneTwo — 2 records
Oneiro — 1 record
Onra — 1 record
Oofort — 1 record
Operator — 1 record
Operator (DE) — 1 record
Oppressed By The Line — 1 record
Optimystica Orchestra — 1 record
Opus — 1 record
Orange Crush — 1 record
Orbital — 16 records
Orchester Anthony Ventura — 1 record
Orchester Helmuth Brandenburg — 1 record
Orchestra Dieter Reith — 1 record
Orchestra Peter Thomas — 1 record
Orchestral Manoeuvres In The Dark — 9 records
Organ — 1 record
Organisation — 1 record
Organoid — 1 record
Orianthi — 1 record
Oriol — 1 record
Orkiestra Rozrywkowa PRiTV — 1 record
Oronzo De Filippi — 1 record
Orthodox Christian Chorale Of Metro Detroit — 1 record
Orup — 1 record
Oscar Lindok — 1 record
Oscar Sala — 1 record
Ose — 1 record
Oskar Linnros — 1 record
Osymyso — 1 record
Otros Aires — 3 records
Ott — 3 records
Ott Lepland — 1 record
Ottawan — 1 record
Otto Knows — 1 record
Ottodix — 1 record
Outcaste — 2 records
Outdoor In The Trashcan — 1 record
Outputmessage — 2 records
Oval — 4 records
Ovuca — 2 records
Owl City — 5 records
Oxyd — 2 records
Ozzy Osbourne — 1 record