- Kirkpatrick, John1
- Kirkpatrick, Ralph1
- Kosciuszko Foundation1
- Koussevitzky, Serge, 1874-19511
- Labunski, Wiktor, 1895-19741
- Ladies’ Auxiliary of Stuyvesant Polyclinic Charity Musicale1
- Lawrence, Robert, 1912-19811
- Lehmann, Lotte1
- Leschetizky, Theodor, 1830-19151
- Luce, Ruth Caster1
- MacDowell Club Benefit Concert1
- Maddry, Mary1
- Mannes, David, 1866-19591
- Markot, Henry1
- Mellos1
- Melville-[L], Marguerite1
- Menotti, Gian Carlo, 1911-20071
- Miller, Philip Lieson, 1906-19961
- Mitropoulos, Dimitri, 1896-19601
- Moiseiwitsch, Anna1