I like Celtic Woman, I got there CD for Christmas.
Go to youtube and type in Adrian Von Ziegler he has lots of good music!!
This is not celtic, but it is close:https://www.youtube.com/watch?v=aJBpLQrBJXM
I love the soundtrack it is from, look into it more if you like this instrumental ^.^
there are more energetic ones, feel free to ask for suggestions :D
that is more dance music
Gotta love clannad