In the concert I saw them in here in Columbus, they didn't have a piper or Celtic artists with them, but they did have a bluegrass band (good bluegrass, not the country-takeoff stuff) and a harpist with them. You'd never think they'd all fit together, but it worked. And it worked nicely.

The leader of the bluegrass band made the comment, though, that musically, they all came from the same place. In other words, bluegrass and traditional Celtic music had similar starts in the rural music of Ireland.