The Wolfetones have been together foe over30 years and play the best celtic, folk and rebel songs. They are not a celtic rock band. For cletic rock check out 'the Horslips - the Tain'. Brilliant stuff.
Check out http://www.wolfetonesofficialsite.com
for information on the boys. THey even did a version of that great classic 'Flower of Scotland'. I went to see them live recently. Magic stuff.