Seems to me, reading this thread, that there are more issues here than "accents". People have used the word "inflection" and I seem to think that "dialect" has also been mentioned. I think we have to differentiate between these three things.

I love the Scottish song (Breton tune!) Twa Corbies. I have heard it anglicised and even the great Dransfields seem to emasculate it that way. I picked it up from Scots singers and I endeavour to sing it in Scots _dialect_ but I wouldn't dare to attempt a Scots accent. I'd be very surprised, however, if my rendering does not have some Scots inflection in it. I came into this folk thing at a time when Scottish groups were in the ascendancy (eg Hall and McGregor) and my earliest repertoire was, therefore Scottish. Some of those great songs stay with me. I hope I don't sing them in an ersatz Scottish accent but in most cases anglicising them seems wrong.

Frank L