CTMA - Comhaltas Traditional Music Archive
Wellington Irish Sessions Tune Archive
Traditional Irish Tunes on The Session
Ireland Information site - music archive, too.
Pete Braccio's Session Tunebooks
The Music of Sliabh Luachra
The Music of Julia Clifford
Friends of Sliabh Luachra
Handed Down Scartaglin Sliabh Luachra Archive
Irish Traditional Music Tune Index - Alan Ng's Tunography
Alan Snyder's Cape Breton Fiddle Recording Index. Click on each Album name to view the list of titled tracks recorded.
Taylor's Traditional Scottish Tunebook
Semantic Index of North American, British and Irish (The Fiddler's Companion)
Scottish Country Dance Database - tunes & recordings
Highland Music Trust - more free downloads.
Eric Allan, Scottish Music - check out the free arrangements.
The Book of Scottish Song - an amazing archive of LYRICS ONLY (Wikisource).
Henrik Norbeck's ABC Tunes - 2638 Irish tunes, as well as Swedish and others.
Pennsylvania State University has many Celtic, Canadian, and New England Reels, Jigs, Polkas, Hornpipes, Airs, etc...
Amazing collection of Irish sheet music with audio example from the Clare County Library.
The ITMA Digital Library - a HUGE treasury of Scores, MP-3 Sound (even for some obscure, unidentified tunes!), Photos, Documents and Videos.
THANX TO ALL - for the contributions to this Archive!
The more the better!
Please just PM me if you have a site to add.