- Lightner, Helen, 1917-20031
- Lightsey, Kirk1
- Ligotti, Albert1
- Lincoln Income Life Insurance Company1
- Lindahl, Gerald (Baritone)1
- Lindsey, Mort, 1923-201219
- Linhart, Buzzy1
- Linley, Thomas, 1756-17781
- List, Garrett3
- Listokin, Robert1
- Liszt, Franz, 1811-18861
- Lit?u?l Enjelsu? (Musical group)1
- Little Steven1
- Little Walter, 1930-19681
- Lobo, P. J. (Pedro Jose?)1
- Lockwood, Annea, 1939-1
- Lockwood, Dorothy1
- Lockwood, Normand, 1906-20022
- Loewe, Frederick, 1901-19881
- Loft, Abram, 1922-20191
- Lombardi, Luca1
- Lombardo, Robert, 1932-1
- Lora, Antonio, 1899-19651
- Lora, Edna Elsa1
- Lost Sea Dreamers (Musical group)1
- Louisville Orchestra1
- Louwenaar, Karyl1
- Low, Edward1
- Lower East Side (Musical group)2
- López, Elías, 1937-1
- Lucarelli, Bert2
- Luening, Otto, 1900-199622
- Lugovoy, Nina4
- Lully, Jean-Baptiste, 1632-16873
- Lundy, Joyce1
- Lupo, Thomas, -16281
- Lybbert, Donald1
- Lynch, Ynez1
- Lyons, James, 1925-19731
- MacDowell, Edward, 1860-19082
- MacInnis, Donald, 1923-20031
- MacKaye, Percy, 1875-19561
- MacNeice, Louis, 1907-19631
- Macbride, David1
- Macchia, Salvatore2
- Maceda, José1
- Macero, Teo, 1925-20082
- Maclay, Otis1
- Macneil, Alan1
- Madison Square Garden (New York, N.Y. : 1925-1968)1
- Mahler, Gustav, 1860-19115
- Maines, Ken1
- Majewski, Virginia1
- Makanowitzky, Paul, 1920-1
- Makas, Anthony2
- Malekpour, Utaco1
- Malko, Nicolai, 1883-19611
- Mallarmé, Stéphane, 1842-18982
- Malvin, Arthur11
- Mandel, Mel1