While honeymooning in Scotland in 2001 we spent a week in Edinburgh during the Fringe Festival. On a couple of occasions we saw a shaggy haired, bearded group of musicians (pipers and drummers) dressed (as I recall) in great kilts and possibly animal skins - maybe 8 or more of them. The raw energy of their performance was incredible. I half expected the crowd to don kilts and sword and march down to London!

I've tried to figure out who they were but have failed. Any ideas?