Are we looking for Celtic metal or folk metal or punk? If you want some killer folk metal, Blind Guardian and Nightwish are my favorites.

Check out these two songs:

Valhalla- http://www.youtube.com/watch?v=CZ_VFJn2kJM This is about as heavy as BG get

The Bards Song- http://www.youtube.com/watch?v=Zklqr...eature=related Good and mellow, and really sums these guys up- they're bards; musical storytellers.