A variant by Francis McPeake of the the song “The Braes of Balquhither” by Robert Tannahill, a contemporary of Robert Burns. The Braes of Balquhither” in turn is likely to have been based on the traditional song “The Braes o’ Bowhether”.
Wild Mountain Thyme is also often known as “Purple Heather” and “Will Ye Go, Lassie, Go?”.
We play a version very similar to The Corries version linked here.