The original title - in any book of Burns' poetry is "Song Composed in August": my interpretation is that it is a reference to "The Glorious Twelfth" - the start of grouse shooting in Scotland. It always amazes me that some folk sing it all the way through in the same sweet tone of voice (not necessarily DG however!)when I am sure the third verse is angry, a protest against blood sports -
"Avaunt away, the cruel sway,
Tyrannic man's dominion,
The sportsman's joy, the murdering cry,
The fluttering gory pinion".
I go back to tips given me by a couple of very good singers: "read the words, make sense of them, then put the sense into your singing".

Oh, and one young band even left that verse out!

OK, rant over, it's still my favourite Burns song of all time for the beautiful imagery in ALL of the verses, and he wrote it when so young too.