Best concert finale ever! This traditional Scottish song was known at least as early as 1605, when a portion of the first stanza was written in a farewell letter, as a poem now known as "Armstrong's Goodnight", by one of the Border Reivers executed that year for the murder in 1600 of Sir John Carmichael, Warden of the Scottish West March.
The Parting Cup was the final hospitality offered to a departing guest. Once they had mounted, they were presented one final drink to fortify them for their travels. The custom was practised in several continental countries.
It was allegedly the most popular song sung in both Scotland and Ireland before Robert Burns wrote "Auld Lang Syne".