Interestingly enough, it was Brian Epstein & The Beatles who came up with Multi-tracking, the building block of most of today's recordings.
I'll agree with you on the Barney & Ronnie statements but respectfully disagree on the subject of Luke Kelly. I don't think that he ever got the respect which is so often lavished upon him today. Stan Rogers falls into the same category in this regard. My opinion for what it's worth.
As for "Rose of Allandale", while I do like both The Corries' & Mary Black's versions equally, I must admit that the song itself, kind of passes me by too. You either get it or you don't. I suppose & I don't.