Check whether AR RE YAOUANK are your cup of tea (cider much more, they are from Brittany). They transformed traditional breton music to a degree where it can really rock.
First time we heard them they had just released their album Troisième Acte featuring some emotionally quite stirring tracks, so I bought and still recommend the album. However, we experienced what other people have describe: sitting through the entire album may be somewhat, er, demanding (as much on account of the melodeon as the pipes, though).
http://www.arbedkeltiek.com/saozneg/music/yaouank.htm#fest