Publishers – M
Publishers: M-Disc - Montague Music Publishing
- M-Disc
- M. Baron Company
- M. van Hell
- M.P. Belaieff
- Maecenas Music
- Magnasoft Publications
- Magnet Music
- Maina Publishing
- MakeMusic
- Maleham Publishing
- Mally Productions
- Mandarin
- Manhasset Specialty Company
- Manhattan Beach Music
- Manners McDade
- Mannheimer Musikverlag
- Mansarda Sintra
- Manual De Falla Ediciones
- Mapa Mundi
- Mapac
- Marbel
- Margun Music
- Mark Custom Recordings
- Mark Foster Music
- Mark Wessels Publications
- Marko Kalkman
- Marlborough House Music
- Martin & Co Guitars
- Maruka Music
- Mascot Music
- Masterclass Music
- Masters Music Publications
- Mathematical Association of Western Australia
- Matthias Hohner
- Max Eschig
- Max Hieber Musikverlag
- Mayas Music
- Mayfair Montgomery Publishing
- Mayfair Music
- MBI Publishing Company
- MCA Music
- McGann
- McGraw-Hill
- MCS
- McTier Music
- Media Factory
- Megan Claire
- Megido Publications
- Mel Bay Publications
- Melos Musik
- MenaceJimenez Publications
- Mercury Music Corporation
- Meredith Music
- Meridian Publishing
- Merseburger Verlag
- Metro Gnome Music
- Metropolis Music Publications
- Mieroprint Musikverlag
- Mifasolo Muziekuitgeverij
- Migdal Publishing
- Mighty Bright
- Mildew Designs
- Milford Trust
- Miller Freeman Books
- Miller Music
- Mimram Music
- Mirasound BV
- Missy Raines
- Misterioso Editions
- Mitropa Music
- Mixta Music Publishing
- MKT Musikit
- ML Associates
- Modern Drummer Publications
- Modern Music School
- Modern Part Songs (Bosworth)
- Molenaar
- Molly Moon Arts & Publishing
- Moncur
- Montague Music Publishing
Publishers: MorningStar Music Publishers - Mutual Publishing
- MorningStar Music Publishers
- Morton Gould
- Mosch Musikverlag
- Möseler Verlag
- Mostyn Music
- MPL Communications
- Mr J W Heringman CDs
- MT Trust
- Murphy Method
- Music Box Publications
- Music Bridge Publications
- Music Company
- Music Exchange
- Music Factory
- Music for Kids
- Music Games
- Music Garden
- Music Gifts Company
- Music Maker Books
- Music Marvels
- Music Master
- Music Minus One
- Music Partner
- Music Plaza (Bos Agy)
- Music Sales
- Music Sales Furtados
- Music Score
- Music Tech.
- Music Vault
- Musica Baltica
- Musica Britannica
- Musica Mundana
- Musica Practica
- Musica Rara
- Musica Russica
- Musical I Press
- Musicards
- Musicians Institute Press
- Musicians Publications
- Musicland
- Musicom
- Musicript
- Musictek
- Musicwear
- Musicworks
- Musik & Theater
- Musik Fabrik Music Publishing
- Musik Verlag Bornmann
- Musik Verlag Rappel
- Musikk-Husets Forlag
- Musikverlag Andrea Wiegand
- Musikverlag Bauer
- Musikverlag Bernhard Geiger
- Musikverlag Bruno Uetz
- Musikverlag C.F. Schmidt
- Musikverlag Frank
- Musikverlag Geiger
- Musikverlag Hafner
- Musikverlag Harald Burger
- Musikverlag Hildner
- Musikverlag Holzschuh
- Musikverlag Josef Preissler
- Musikverlag Rainer Schottstädt
- Musikverlag Raisch
- Musikverlag Reinau
- Musikverlag Richard Stegmann
- Musikverlag Scherbacher
- Musikverlag Siegfried Rundel
- Musikverlag Tatzer
- Musikverlag Varner
- Musikverlag Vogt & Fritz
- Musikverlag Wolfgang Grünbauer
- Musikverlag Wolfram Heinlein
- Musikverlage Hans Gerig KG
- Musikwissenschaftlicher Verlag
- Musix
- MusT
- Mustard
- Mute Song
- Mutual Publishing