"M" Composers
- Macarthy, Harry
- MacDowell, Edward
- Marriott, C. H. R.
- Martucci, Giuseppe
- Marzials, Theodore
- Mason, Lowell
- Mason, William
- Massenet, Jules
- Mattei, Tito
- Maybrick, Michael
- McGlennon, Felix
- McNaughton, John Hugh
- Mendelssohn, Felix
- Methfessel, ?
- Meyer-Helmund, Erik
- Meyerbeer, Giacomo
- Mills, S. B.
- Mineo, Enrico
- Molloy, James L.
- Monk, William H.
- Moore, Thomas
- Moszkowski, Moritz
- Mozart, Wolfgang Amadeus
- Mullen, John
- Muse, A. E. A.
- Musgrave, Frank