"The Yellow-Hair'd Laddie", an 18th-century Scottish song, is my earworm of the week. I have two versions (at least): one with a complex variation in "The Caledonian Pocket Companion" vol. 2 and the melody with a harmony part in "O'Farrell's Pocket Companion". I played it on mountain dulcimer and violin, and I recorded the version with harmony on mountain dulcimer.
Here it is in the National Library of Scotland:
We plan to rehearse this song at practice tomorrow. I have the arrangement in my head, just needing to convert that internal sound to physical reality. My only lack is a cellist.