I haven't heard any of Cillian's playing, but I gather he's one of the Armagh Vallelys? (My sister played in an outfit once with Darragh Vallely, who may or may not be related to the Brains and Nialls and Cillians.) He's certainly mentioned a lot on the Armagh Pipers Club pages. Maybe next time I'm over home - about ten miles from Armagh - I might get a chance to catch some of his music.