I love The Demon Barbers - partly for the great performance atmosphere.

Not to familiar with them but for atmosphere, I do/did like Damien. Years ago (late 80s/ early 90s I think) he used to be a regular to the bi-annual Bangor Festival. He had the abilty in a (mostly Irish) session to strike up say on English Concertina and sing quite powerfully and would choose his timing for a song in a mostly instrumental session carefully and had another ability too - to capture the attention of everyone around - even the players who would be normally wanting to get on with jigs and reels rather than listen to a song.