Name
- Lovett, Leon, conductor, fl mid 20th century1
- Maison Brahy, of Liège; music dealers, fl 1947-19591
- Malmström, of Malmö; music dealers, fl 1956-19591
- Marken, Bob, Dutch composer, b 1915, http://isni.org/isni/000000...1
- Markevitch, Igor, French composer and conductor, 1912-1983, http://isni.org/isni/000000...1
- Maxfield, Richard Vance, American composer, 1927-1969, http://isni.org/isni/000000...1
- Mayer, Robert, Knight, music patron, 1879-19851
- Małcużyński, Witold, Polish pianist, 1914-1977, http://isni.org/isni/000000...1
- McAllister, Gilbert, journalist and Member of Parliament, 1906-1964, http://isni.org/isni/000000...1
- McCredie, Andrew Dalgarno, Australian musicologist, 1930-20061
- Menuhin, Hephzibah, pianist, 1920-1981, http://isni.org/isni/000000...1
- Metropolitan Opera, New York, United States, 1883-1
- Miller, Alan, of Grimsby, music librarian, b 19261
- Mills Music Ltd., fl 1953-19571
- Moeschinger, Albert, Swiss composer, 1897-19851
- Mott, Günter, manager of Boosey and Hawkes Bonn, fl 1956-19681
- Mundy, John, cellist, 1886-19711
- Music Publishers' Association, United Kingdom, 1881-1
- Musicians' Union, United Kingdom, 1921-1
- Mycielski, Zygmunt, Polish composer, 1907-1987, http://isni.org/isni/000000...1