Even though Muttley and others have mostly dealt with what they need, I remember that I... and Jim McLean... posted about this song in an older thread: http://mudcat.org/thread.cfm?threadid=3417 that started in 1999 and continued off & on till 2007.
You must read carefully to figure out exactly which words and especially which TUNES are 'original' and which are sung by whom. In that older thread, Jim notes: "Did you compare the air sung by McDonald to that printed in your scan? They are entirely different as I posted previously. McDonald sings McPeake."
This is 'almost' the case.... but John McDonald uses a slightly different tune than the one the McPeakes made popular for "Wild Mountain Thyme". McDonald's tune is a bit harder to carry and though pretty, is repetitive, since he doesn't do it with a chorus added. The McPeakes, I feel, made that basic tune more 'singable', though I prefer McDonald's for Braes o Balquhidder.
Now... I recently got a machine that will play an LP and convert it to MP3s, and I shall endeavor to create an MP3 version of the LP...in the relatively near future...(like after Xmas..or January?)... and make Braes o Balquhidder available to those who'd like to hear the Topic records version.

If I get distracted & forget, PM me or refresh this, though I WILL put the LP in plain sight to jog my memory.