• Ives, Charles (1874-1954)
  

• Jacquet de la Guerre, Elisabeth-Claude (C. 1666-1729)
  
• Joplin, Scott (1868-1917)
  
• Josquin des Prez (c. 1440-1521)
  

K

L

• Lansky, Paul (1944-)
  
• Larsen, Libby (1950-)
  
• Leoncavallo, Ruggiero (1857-1919)
  
• Ligeti, György (1923-)
  
• Liszt, Franz (1811-1886)
  
• Lutoslawski, Witold (1913-)