I listened to these guys on TBN (Christian Network) yesterday and I beleive this guitarist is as good as Chet Atkins - or any other I've ever heard. I was mesmerised by both of their ability with their respective instruments, the one brother plays flute, xylophone, and I think bagpipes.
The music is Christian based but many of the old traditional tunes I did not recognise due to the artistic liberalcy with which they interpreted the songs. Quite amazing -
Go here for their site - even a few sound bites