http://www.tradsong.freeserve.co.uk/Indices.htm

fiddle databases:

http://www.iland.net/~bshull/NAFA/data_l.htm

excellent folk links page (esp Australian):

http://www.folk-sa.asn.au/FolkFederation/links.htm

Smithsonian's Rinzler Folklife Archive links page, exhaustive!:

http://www.folkways.si.edu/linkspag.htm

Celtic Circle's Song Lyric Link page:

http://www.social-dancing.com/lists/

British Song Fa La La: database & song literature 16th cent-present:

http://www.public.asu.edu/~icwwh/

Cantus: database for Latin Ecclesiastical Chant:

http://publish.uwo.ca/~cantus/

Medieval Music Database:

http://www.lib.latrobe.edu.au/Audio-Visual/Stinson/medmusic.htm

Women Song Composers Database Published in the United States and England, ca. 1890-1930:

http://musdra.ucdavis.edu/faculty/reynolds/Women_songs_home.html

Fasola, the Shape Note Singing page, includes links to tune collection info:

http://fasola.org/

Indiana University's Archive of African American Music & Culture:

http://www.indiana.edu/~aaamc/index.html

Guide to Copyright for Music Librarians:

http://www.musiclibraryassoc.org/Copyright/copyhome.htm

Redhot Jazz Archive, history of jazz pre-1930, w/database of tunes:

http://www.redhotjazz.com/

Freefolk's links page, w/usual suspects:

http://www.freefolk.com/tddata.htm

The excellent Mississippi State Univ's Charles H. Templeton's Digital Sheet Music collection (rags, blues, war songs, popular songs, etc):

http://library.msstate.edu/ragtime/main.html

Max Hunter Folk Song Collection of Ozark Mountain folk songs (in progress, but well worth the trip, due to be complete by summer 2003):

http://www.smsu.edu/folksong/maxhunter/

African Music Archive (includes diaspora music like Jamaica folk music, etc) mostly links to realaudio collections, rather than indices and databases:

http://ntama.uni-mainz.de/~ama/