- Juilliard School of Music1
- Kinkeldey, Otto, 1878-1966.3
- 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
- Koussevitzky, Serge, 1874-1951.4
- Kreisler, Fritz, 1875-19621
- Kreisler, Fritz, 1875-1962.2
- Labunski, Wiktor, 1895-1974.1
- Lawrence, Robert, 1912-1981.2
- Lehmann, Lotte1
- Leschetizky, Theodor, 1830-191535
- 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
- Meetings2
- Meetings.38