- Kos?ciuszko, Tadeusz, 1746-18171
- Kosciuszko Foundation1
- Kosciuszko Foundation<br> Leschetizky, Theodor, 1830-1915<br> Concert programs<br> Hughes, Edwin, 1884-1965<br> Paderewski, Ignace Jan, 1860-19411
- Kreisler, Fritz, 1875-19621
- Labunski, Wiktor, 1895-1974.1
- Lehmann, Lotte1
- 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