Funny you should ask. I was thinking today that there is definitly a connectuon between this song and a song i Irish called AN SAGAIRTÍN which is related to a northern song titled TIOCHFAIDH AN SAMHRADH. If you play around with the tune of TIOCHFAIDH AN SAMHRADH, it is not too far off from SHE MOVED THROUGH THE FAIR. There is a version of AN SAGAIRTÍN by Máirtín Tom Sheáinín on his CD (I'll be back).

Brían.