I think there is very little time that has to be involved. Down on the Mira came out and was instantly sung around the world....you'd hear it in the Woolworth stores in Newfoundland. Sonny's Dream...rockish in Newfoundland, got picked up by Irish singers, sung like a dirge in Ireland, and now people think that is how it should go. Good songs can go really really fast.....Sweet forget me not...revived (I was told) by someone who picked it up itn the outports of Newfoundald..think he was Linda Slade's brother in law...spread like measles throughout Newfoundland and then back to Ireland and to the U.S. Someone really should look at the role Newfoundland plays in some of these song migrations...a huge population of singing people with roots in Ireland, England and sort of French Canada..sort of...with great ties to the Boston States..with a very educated traveling "class" of university types....mg