This is extremely interesting esp in light of Maine's history of the early Scots-Irish settlers and our coastal rivalries between fishing families. "The Lobster Gangs of Maine" is a good book on the subject.
A good percentage of the traditional songs collected here in Maine are Scots-Irish and an interview with an elderly resident of one of the islands revealed that certain songs and dance tunes were played and sung exclusively on individual islands...one woman was forbidden by her grandfather to sing "faction songs".