Publisher whose last names start with "M":
- M L Bianco (2)
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- Machinists Union Press (7)
- Mad Guitar Records (9)
- Madecroft Publishing (160)
- Madelyn Byrne (2)
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- Madison Street Music (57)
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- Maecenas (339)
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- Magali Le Roy (14)
- Maggie Creek Music (22)
- Maggie's Music (2)
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- Magic Tune (7)
- Magnamusic Distributors Inc (3)
- Majestic Music Publications (416)
- MakeMusic (15)
- Makris Foundation and Mediterranean Press (1)
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- Mallory Byers (1)
- Mandi Kitchen (14)
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- Manhattan Beach Music (261)
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- Mannheim Steamroller (22)
- Manontroppo Music - Charles Small (7)
- Maori Platt (1)
- Mapa Mundi (10)
- Marc Antoine (1)
- Marc GARETTO - Harmonie Editions (42)
- Marcelo Fortin (1)
- Marcelo Torca (216)
- Marco De Zotti (2)
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- Marco Polo (266)
- Marcorenzo Giulio (1)
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- Marcus Day Music (9)
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- Margarita Zelenaia (2)
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- Mark Attebery Studio (1)
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- Mark Custom Music (1620)
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- Mark Peltz Publishing (6)
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- Mark Rice (1)
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- Mark Templeton Choral Music (52)
- Mark Wayne Music, LLC (93)
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- Marko Hkkinen (10)
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- Markus Plattner Digital Sheetmusic (56)
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- Mary W Jackson. (15)
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- Masha Aleskovski at MashaMuse (3)
- Maskarade Publications (47)
- Masquerade Music (13)
- Masterflute (62)
- Masters Music Publications Inc. (2606)
- Mastertrax (424)
- Mat Kim (16)
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- Matias Bacosky (2)
- Matrix Publishing (620)
- Matt Avery (2)
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- Matt Dury (19)
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- Mayas Music (99)
- Mayron Cole Music Conservatory, Inc. (263)
- Mboya Nicholson (2)
- MCA (24)
- mcbleke (7)
- McGinnis & Marx Music Publishers (341)
- MCH Music Centre (1)
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- McX Publishing (1)
- MDB Editions (9)
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- MDS (Music Distribution Services) (264)
- MEA Music (134)
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- Meadow Run Music ASCAP (64)
- Meadowlark Melodies (92)
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- Medici Arts (1)
- Meera Popkin-Tarack (7)
- Meghan Murphy (2)
- Megido Publications (49)
- Mehran Badakhshan (2)
- Mel Bay Publications - Digital Sheet Music (185)
- Mel Bay Publications, Inc (2696)
- Mel Bay Publications, Inc - Digital Sheet Music (2028)
- Melanie B. Guerin (10)
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- Melinda Coles (9)
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- Melodia Music, LLC (1)
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- Mladen (1)
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- The Moanin' Frogs (2)
- Modal Music (16)
- Modern Drummer Publications (30)
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- Modrana Music Publishers Ltd (15)
- Moeck Verlag (6)
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- Mohab Sameh (7)
- Mohammad Ali Heidari-Shahreza (9)
- Molenaar Edition (13250)
- Molly Moon Arts & Publishing (1)
- Molto Music (1)
- Monaghan Music, LLC (132)
- Monarch Music (958)
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- Monique Berthoud (4)
- MonMuse (23)
- Moonhouse Music (88)
- Morakot Cherdchoo-ngarm (7)
- Moran Education (21)
- MorningStar Music Publishers (4171)
- MorningStar Music Publishers - Digital Sheet Music (1802)
- Morton Gould (5)
- Moseler Verlag (1573)
- MOTORCOACH RECORDS & PUBLICATIONS,L.L.C. (1)
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- MSB Publishing (349)
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- Musedita Edizioni Musicali (320)
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- Music Makers, Inc. (27)
- Music Minus One (774)
- Music of Randys (2)
- Music Online UK (1)
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- Musica Rara (727)
- Musica Russica (631)
- Musical Moods Publishing Co. (12)
- musicarrangements4u.com (7)
- Musicart Publications (2)
- Musicians Institute Press (121)
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- The Music of Alistair Coleman (2)
- MusicPAD Music Publications (29)
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- Musik Fabrik (2426)
- Musika Publishing Australia (675)
- Musikk-Husets Forlag (1964)
- Musikverlag Engelhart (1696)
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- Musikverlag Vogt & Fritz (2080)
- MusiqueMagique (2)
- Musisca Publishing (17)
- Musix (4)
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- Muzyka (181)
- MVD (152)
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- Mystic Publishing (17)