well i know the Celtic culture was active in france and spain as well as ireland and elsewhere...in france especially in Brittania (Bretagne?)
and according to the band Llan de Cubel in Asturias
http://www.angelfire.com/nj/xjoyx/llan.html
http://www.lanuevaespana.es/multimedia/musica.htm
http://www.sfcelticmusic.com/spain/celtica.htm