I saw part of the "Celtic Women" concert and thought it was very "airy fairy". I didnt' enjoy it and turned to a different channel. Regarding opera singers performing folk - I once bought an album of Placido Domingo singing Argentinian tangos. I love tangos, they're passionate, gritty, all emotion. Placido Domingo's voice was magnificent but his phrasing was awful and the songs sounded totally canned and stilted - I felt that he murdered those tangos. Perhaps that's too strong a word, but he sure sapped them of their vitality. Thats one album I literally threw in the garbage.