O-Rama

O.L.

Oak

Oasis

Oats Moo

Oausa

Object Music

Oblique

Obscure

Obscure World

Observatory

Obvious Moose

OC5

Ocean

Ocora

ODA

Ode

Ode Records

Odeon

Odeon / Alhambra

Odin

Odyssey

Odyssey Music Network

Off The Hook

Offence

Official

Ogun

Ohr

Oi! Hammer

OJC

OKra

Old Friends

Old Homestead

Old Timey

Old Town

Olde World

Oldie Blues

Olfactory

Olive Branch Records

Olive Tree

Olivia

Olle

Olmec

Olydor

Olympia

Olympic

Olympico

OM

Omari

Omega

Omni Arts

Omni Sound

Omnisound

Omnivore

Omnivore Recordings

Omplatten

OMV / Preisser

On The Air

On The Spot

On-U

On-U Sound

Onari

Ondine

One Little Indian

One Man Band

One Percent

One Star Project

One Way Static

One Way Static Records

One-Up

Onslo Record

ONYX

Opal

Open

Open Air

Open Circle

Open Sky

Open Wide

Opera

Opera Buffa

Optimism

Optimism Incorporated

Opus

Opus 3

Opus One

OR

Orange

Orange Records

Orbis

Orbitone

Oresound

ORF

Orfeo

Orfeon

ORG

ORG Music

Organic Music

Oriel

Origin

Original

Original Blues Collections

Original Jazz Classics / Prestige

Original Jazz Classics ?/ Prestige

Original Jazz Library

Original Music

Original Recordings Group

Original Records Group

Original Recoreds Group

Original San Francisco Record Company

Original Sound

Orinda

Orion

Orion Master Recordings

Orion Super Analog

Ork

ORO

Orphee

Orpheus

Orphic Egg

Ortho Jazz

Oryx

Oryx Romantic

Osmosis

Ossum Possum

OTHER SIDE OF DESIRE

Our First Record

Our Gang Entertainment / Mirus Music

Out

Out Loud

Out Of Darkness Records

Out Of Tune

Out Of Your Element

Outer Battery Records

Outline

Outstanding

Ovation

Ovation Records

Oversea

Overseas

Overseas Records

Overtone

Overweight Rat

Owl

Oyster

Ozit Morpheus