Just before Mairead started with Celtic Woman, she took part in the concert of O'stravaganza in Lorient. For those who don't know, O'stravaganza was a project by Hugues de Courson which mixed the music of Vivaldi with irish rhythms and instruments. And here's the concert on YouTube.
http://www.youtube.com/watch?v=GM9tleK5XOkAs you can see, Mairead shines, but that's hardly a surprise, isn't it ?