http://www.sacred-texts.com/neu/celt/mlcr/mlcr01.htm
http://www.angelfire.com/home/thefaery5/
I only briefly scanned the above sites, but what do these "celts" have to do with the "diddley diddley" played way too fast music that gets called celtic today. What happened to the melody of the tunes?
I find I can still hear the melody in so called "english" music, as in general it is played at a speed you can still hear the tune and not just the twiddley ornamentation.
JohnB