List of 20th Century Classical Composers
- Wikipedia entry linked to individual biographical articles plus internal references and external links.
- http://en.wikipedia.org/wiki/List_of_20th_century_classical_composers

The Modern Era (1900 - 1945)
- The Conservatory at Humanities Web outlines the rise of post-romantic music, rhythmic, harmonic, and tonal experimentation, and lists major composers with biographies, suggested reading, and additional resources.
- http://humanitiesweb.org/human.php?s=c&p=i&a=l&ID=8

20th Century: 1900-Present
- Introduction to recent compositional work from Essentials of Music. Linked to details on historical themes, musical context, style, and living or recently deceased composer biographies.
- http://www.essentialsofmusic.com/eras/20thC.html