Haven't seen these in the Mudcat Links section, though they may be there. Hard to tell when the Links index is so confusing.

http://www.lib.washington.edu/Music/world.html

http://www.nypl.org/research/lpa/mus/mus.resources.html

http://polsong.gcal.ac.uk/

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

http://www.folklore.bc.ca/Linksusa.htm

http://www.crixa.com/muse/unionsong/musites.html

http://www.chivalry.com/cantaria/related/index.html

http://www.scoiltrad.com/

http://www.music.indiana.edu/music_resources/genres.html

http://www.ipl.org/ref/RR/static/hum20.60.00.html

http://www.cbmr.org/