Oh, I love this band. The singer has such a lovely voice.
Speaking of traditional songs, there is quite an interesting Russian folk music project "Clann Lir". They're all Russian, but perform songs in Irish Gaelic, Scottish Gaelic and Welsh. I don't know, maybe the singer's accent will be unpleasant to the native's ear, but I must admit that this band and the beaty of the Welsh folk songs was one of the reasons why I decided to learn the language.
That's my favourite folk song and I sometimes sing along
And this is a combination of two songs: Y deryn du and Gwel yr Adeiladd, which is one of the loveliest Christmas carols I've ever heard. It's my ambition to learn it by Christmas:)