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Mapac
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Marasco Music
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Margun Music
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Marimba Productions
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Mark Foster Music
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Mark Wessels Publications
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Marlo Plastics
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Martin
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Masterpiece Music
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Masters Music Publications
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Maurice River Press
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Max Eschig
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Mayfair Montgomery
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Mayfair Music
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Mayones Guitars
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MBT
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MCA Music
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McCoy's Horn Library
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Medici Music Press
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Mel Bay Publications
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Melos Ediciones Musicales
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Mercury Music Corporation
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Meredith Music
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Merion Music
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Metropolis Music Publishers
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Michael Daugherty Music
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Michael Kelly
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Michael Furstner
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Midi Solutions
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Mildew Designs
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Milliken Publishing Company
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Milne
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Mimast Inc
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Mimram Music
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Minstrel Press
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Mitropa Music
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Modern Drummer Publications
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Modern Music
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Moeck
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Molenaar Edition
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Molto Music
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Montague
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Moonstone Music
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Morley
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MorningStar Music Publishers
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Morton Music
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Moseler
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Mozart Allen
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MPL Communications
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Multiple Breath Music