Ceolas Celtic Music Archive
http://celtic.stanford.edu/ceolas.html
Claims to contain the largest collection of Celtic music information that is available online. Receives about 1,000 visits a day. The concentration is on Irish and Scottish music, though the music of Wales and Brittany is also represented. Provides a guide to Celtic music resources, artist profiles, discographies, reviews, sound samples, concert and festival schedules. Also featured are tune indexes, music software, a guide to musical instruments, and links to countless other sites.