and just to add a wee bit mair -
As the guitarist in 'Heritage' I can tell you that our way of 'Jinglin John' came from 'The Caledonian Pocket Companion' compiled by a Fifer (like me) called James Oswald in the mid 1700s. It is one of the great Scots fiddle music collections, but unfortunately (unless someone can tell me differently) is no longer available except in a few libraries. If you can lay your hands on a copy it has some great versions of well known tunes as well as many many less well known ones.
BTW - Malcolm is (as usual) absolutely spot on regarding the Scots language.