Contemporary Music (1945 - 2000)
Overview of the rise of technology and minimalism in late 20th century composition from The Conservatory at Humanities Web. Includes links to profiles of those involved in the period.

Don Gillis Music
Celebrating the life and music of composer and conductor Don Gillis, Sr.

List of 20th Century Classical Composers
Wikipedia entry linked to individual biographical articles plus internal references and external links.

Music History 102: The Twentieth Century
Composers, major styles and developments, illustrations, and Real Audio RAM sound files from the Internet Public Library

The Late Twentieth Century
General exploration of musical changes and experimentation in light of societal shifts during the period. Includes links to representative composers of the time.