History in Song
Includes annotated texts about American history, from Revolutionary War songs to 1960's anti-war protests.
http://www.fortunecity.com/tinpan/parton/2/

Almanac of Classical Music History
Birth and death dates of composers and performers; first performances of famous works.
http://www.angelfire.com/biz/acousticdigest/almanac.html

Music and Chess
An annotated bibliography of musical compositions related to chess.
http://www.greschak.com/muschess.htm

Medieval Music and Arts Foundation
Early Western and traditional non-Western music: Recording suggestions, discussion, articlesl links.
http://www.medieval.org/

Incompetech: Music Styles
Brief, tongue-in-cheek discussion of musical forms.
http://www.incompetech.com/music/

This Day In Music History
Daily listing of what happened on this day; extensive introductory tutorial on music notation. (CD sales: affiliate)
http://datadragon.com/day/

History of Indian Music
Extensive hypertext article by David Courtney.
http://chandrakantha.com/articles/indian_music/index.html

Classical Musician Recent Deaths
(from 1988 to current)
http://members.tripod.com/perfartists/obits.html

Gallery Music
(Sung by church and chapel "bands" in the UK in the 18th and 19th centuries) Includes articles, sample scores and MIDI files, links, and organizations.
http://www.westgallerymusic.co.uk/index.html

Jewry in Music
Articles and links about the entry of Jews into the musical professions in Europe in the early nineteenth century.
http://www.smerus.pwp.blueyonder.co.uk

Black History and Classical Music
Brief overview and biographical notes about conductors and performers in the classical tradition.
http://chevalierdesaintgeorges.homestead.com/History.html

Eras Online
Basics about the major periods of classical (art) music, with terms, composers, RAM audio examples, and purchase links. From Essentials of Music, sponsored by Sony Classical and W. W. Norton.
http://www.essentialsofmusic.com/eras/eras.html

International Alliance for Women in Music
Includes chronology, extensive biographies of obscure musicians, MIDI files, discography, bibliography, and resources.
http://www.iawm.org/

Corridos Sin Fronteras
Information from Smithsonian Institute about the native Mexican folk music tradition. Includes a graphical timeline, music samples, videos, guides and background material for teachers.
http://www.corridos.org/