- Library of Congress. Exchange and Gift Division1
- Liszt Society (London, England)1
- Liszt, Franz, 1811-18861
- Mannes, David, 1866-19591
- Mannes, Leopold, 1899-19641
- Medals<br>Awards<br>Hughes, Edwin, 1884-1965<br> National Association for American Composers and Conductors1
- Mennin, Peter.1
- Menotti, Gian Carlo, 1911-2007.1
- Miller, Mildred, 1924-.1
- Miller, Philip Lieson, 1906-1996.1
- Mischakoff, Mischa, 1895-19811
- Mischakoff, Mischa, 1895-1981.1
- Moiseiwitsch, Benno, 1890-19631
- National Music Council (U.S.)1
- Neuman, Herman1
- New England Conservatory of Music1
- New York Philharmonic.1
- Ney, Elly, 1882-19681
- Nikolaidi, Elena, 1909-20021
- North Carolina College for Women1