"As for Richard's comments - are you regretting that Burns wrote mainly in Scots (?!), or that few people (Scots or otherwise) bother to seek out the meaning of the song?"

Certainly not that Burns wrote in Scots. I have some regret about people who aren't familiar with Scots not bothering to investigate. But mainly I was regretting the mere fact of a song which has so much else going for it happening to be in a language that is much less widely understood than standard English.

Though I am English, I have a reasonable working knowledge of Scots from many years of listening to songs, particularly some of the "muckle sangs" and those made by Hamish Henderson; and from staying in the Edinburgh area for the last couple of years of my university career. Most English speakers are far less familiar with Scots.