Ah, RoseRed295, as i'm sure you know, By The Bonnie, Bonnie Banks (known more familiarly to us as Loch Lomond) actually tells two stories. The first is the lamenting of a Jocobite prisoner about to be executed, while his comrade is to be set free. The second relates the Celtic myth that, when a Celt dies in a foreign land, the soul is transported underground (the low road) back to the native land before departing the earth for the hereafter.