I'm always interested to see the roots that Appalachian music has in traditional Scots/Irish music. There is a long tradition of great songs that have corresponding versions in each. Because the songs got taught orally and passed on from generation to generation, they change a lot, which is pretty cool.
Anyhow, one song I love is "Black Jack Davey", about a girl who runs off with a Gypsy. The corresponding Irish version is "The Raggle Taggle Gypsy". Here are 2 versions,
and then you get the modernized Jack White version!