It is so well known in Scotland that we often learn the tune in school on the recorder which I demonstrate in the video below. I must apologise that the recorder is a terrible sounding instrument or at least I am terrible at playing it. I learned this back when I was about 12 years old and it is still sitting in my head.
The History of the Song:
It is a song based on the rescue and assistance to get Bonnie Prince Charlie out of mainland Scotland to the Isle of Skye after the Jacobite defeat at Culloden.
Here is my favourite version of the song by the wonderful Corries: