"Kate Dalrymple" is a traditional Scottish reel. The melody is based on an ancient folk-tune. There are accompanying words in Scots, written by William Watt. It tells the tale of the eponymous spinster.
The National Portrait Gallery in London has a painting of the real Kate Dalrymple, a society beauty in her youth.
It is used by the BBC as the theme music for the BBC Radio Scotland dance music programme Take the Floor.
References
Kate Dalrymple Wikipedia(Text) CC BY-SA