Labels – M
Labels: MA Music - Monthabor Music
- MA Music
- Mack Avenue
- Madison Gate Records
- Magdalen
- Magpie Records
- Maguelone
- Major Classics
- Malachite
- Malibran
- Manhattan Records
- Manitoba Chamber Orchestra
- Marc Aurel
- MarchVivo
- Marco Polo
- Marcophon
- Mariinsky
- Mark Records
- Marlboro Recording Society
- Marquis
- Marsyas
- Massimiliano Greco
- Masterclass
- Masterclass Media Foundation
- Masters Brass Nagoya
- Masterworks
- Masterworks Broadway
- Matangi Quartet
- Matchless Recordings
- Material
- Mats Bergstrom Musik
- Mawson and Wareham Music
- Maya Recordings
- Mclassics
- MDG
- MDR KLASSIK
- Medici Arts
- Medici Classics
- Megadisc
- Melba Recordings
- Melism
- Mellos Records
- Melodiya
- Membran
- Memoria
- Memorial University
- Memory Lane
- Menuetto Classics
- Mercury
- Mercury Living Presence
- Mere Records
- Meridian
- Metier
- Metronome
- Metropolis Group
- Metropolitan Opera
- Metropolitan Symphony Orchestra of Athens
- Meyer Media
- MG Music
- Michael Storrs Music
- MicroFest Records
- Micropascal
- Mignarda
- Milan
- Milken Archive Digital
- Minabel
- MinMax
- Minuet
- Mirare
- Mirasound
- Mistral Music AB
- MMB
- MMG
- Mode
- Modern Harmonic
- Moderna Records
- Modesty Music
- Monograph
- Mons Records
- Montaigne
- Monthabor Music
Labels: Moochin About - Myto
- Moochin About
- Morrison Music Trust
- Moscow State Conservatory
- Moshi Moshi Records
- Motéma
- Motette
- Mótettukór Hallgrímskirkju
- Move Records
- Movieplay
- Mozartiana Classics
- MPR
- MPS Records
- MSO Classics
- MSR Classics
- MTG Music
- Multitone
- Münchner Philharmoniker
- Music & Arts
- Music & Media
- Music Agents Red Label
- Music Brokers
- Musica Ficta
- Musica Omnia
- Musica Rediviva
- Musica Sveciae
- Musical Concepts
- Musical Heritage Society (MHS)
- Musicaphon
- Musicas
- Musicians Showcase
- MusicMasters
- Musicube
- Musiepoca
- Musik Museum
- MusiKaleido
- Musique en Wallonie
- Musiques à la Chabotterie
- Musiques Suisses
- muso
- Mute
- MV Cremona
- MVE
- Myricae Classics
- Myrios
- Myto
