I have no idea how traditional the tune is: Ewan MacColl is the only source. I've heard the same tune (with a less militant beat) used for Lowlands of Holland (Patrick Galvin).

SF is Susan of DT--she entered the song (I think)

By the way--am I the only one who isn't sure that unsuccessful forcible sex songs (Eppie Morrie, the Baffled Kight etc.)are less an objection to rape than they are of insufficient force being used? Read the words. Preferably without today's mind-set.