During the Sixties, Corrie Folk Trio with Paddie Bell mirrored their performances with those of The Clancy Brothers & Tommy Makem.
They sang in fake Irish accents which, as it happens, was the way most of us did. The Rose of Allandale, as sung by them, was simply the way that the song was sung at that time. I still remember being pulled up at a party for singing with a Scottish accent.
Mary Black's version was later featured on a compilation album "Green Velvet" I think (the first song on it was "When You Were Sweet Sixteen") and was at that time a brand new approach to the song. I enjoy both versions.
During the Seventies, The Corries who were by now down to two members, Roy Williamson & Ronnie Browne, armed with Roy's "Flower of Scotland, completely re-invented themselves and along with that, Scottish folk music.
Given the two choices which were available to us at that time (Irish or Highland) it was the right move at the right time and their music filled a huge void.
Those of us of who were of Irish stock and those of Highland Stock or who spoke Gaelic were well catered to but there were many Scots who did not fit either of those categories and it would seem, had no songs to sing.
As one person alluded, Roy was a perfectionist as is Ronnie and passionate about his music.
Using much the same technique as The Beatles, new instruments were added for almost every song. They even designed instruments themselves and seemed to master them effortlessly.
The one sad thing in all of this is that they re-introduced the bodhran to Scots. (Something that we had exported to America for a joke. We really didn't want them back)
That you hadn't heard of The Corries is understandable. Mudcatters frequently mention "Household Names" and I have to admit to having heard very few of them but here's a thing... I can tell you that just by looking at the names of Scotland's most popular folksingers of today and listening to a little of what they do, had it not been for The Corries, most of them would have fallen into the "No songs to sing" category and few of you would ever have heard of them.

"Loch Tay Boat Song. Not one of Roy's finest. The most blatant error is his mispronunciation of "Ben Lawers". Not "Lawyers". Other than that... almost as good as meself!