Celtic Thunder is a singing group composed of male soloists Keith Harkin, Ryan Kelly, Neil Byrne - who played guitar and sang backup on the albums before he joined, Damian McGinty, Emmett O'Hanlon, and Colm Keegan. And, formerly, Tenor Paul Byrom, Emmet Cahill, and George Donaldson, as well as Daniel Furlong, (who was a special guest star), who perform both solo and ensemble numbers. Celtic Thunder debuted in August 2007 at the Helix in Dublin