Publishers - M
- M.P. Belaieff
- Magnasoft Publications
- Magnet Music Ltd
- Maleham Publishing
- Manual De Falla Ediciones
- Margun Music
- Mark Foster Music
- Mark Wessels Publications
- Marlborough House Music
- Maruka Music
- Masterclass Music
- Masters Music Publications
- Matthias Hohner
- Max Eschig
- Max Hieber Musikverlag
- Mayfair Music
- MCA Music Ltd
- McTier Music
- Mel Bay Publications
- Melos Musik
- Meredith Music
- Metro Gnome Music
- Milford Trust
- Miller Freeman Books
- Mind Head Publishing
- Mitropa Music
- Mixta Music Publishing
- ML Associates
- Modern Drummer Publications
- Modern Music School
- Modern Part Songs (Bosworth)
- Molly Moon Arts & Publishing
- Monarch Music
- Moncur
- Montague Music Publishing
- Möseler Verlag
- Motif Music
- MPL Communications Ltd
- MT Trust
- Music Box Dancer
- Music Distribution Services
- Music Exchange
- Music Factory
- Music Gifts Co.
- Music Hound
- Music Maker Books
- Music Minus One
- Music Partner
- Music Plaza (Bos Agy)
- Music Sales
- Music Sales Furtados
- Music70
- Musica Britannica
- Musica Rara
- Musica Russica
- Musicians Institute Press
- Musicians Publications
- Musicland
- Musicom
- Musicworks
- Musik & Theater
- Musikk-Husets Forlag
- Musix
- MusT
- Mutual Publishing
- Múzicas Editions
