It's useful to the classical music CD and DVD collector to have a general idea of the music market. The major music producers and distributors along with their main classical music labels are listed below. Three major companies dominate the market with different labels although there are some important smaller distributors.

Sony/BMG
Sony
BMG
Deutsche Harmonia Mundi
Eurodisc
ECM
RCA Victor

Universal (UMG) and EMI
Universal
Deutsche Gramophone
Philips
Decca/London
Archiv
L'Oiseau-Lyre
Argo
Mercury
Gimell
EMI Classics
EMI
Angel Studio
Pathe Marconi
Reflexe
Virgin

Warner/WEA
Warner
Nonesuch
Erato
Teldec
Finnadar

Other major distributors are
Allegro
Brilliant
BIS
Chandos
CPO
Harmonia Mundi
Hyperion
Koch International
Naxos
Qualiton