Ian Pollock--I see from your last post that you reside in Australia, The name Pollock is of course well known in Scotland especially in the parishes of Lochwinnoch and Beith which are both within walking distance from where Tannahill resided in Paisley.
Tannahill knew the area well and indeed, following the death of his father, his mother moved to Boghall, Gateside, Beith, to keep house for her brother, Mathew Pollock, the last of the name of a long line of lairds of that small estate and Tannahill when walking to visit his mother passed the warlock craggy and the linn mentioned in his song "Are Ye Sleepin Maggie" both of which lie about a third of a mile bellow my house.
A small point, in one of your previous posts you mentioned Fergusson, Burns and Tannahill as if they were contemporaries this is of course not the case.
PS--am at present some forty miles from my books etc. so I may have mixed Mathew up with his father and have not worked out yet how to retrieve the emails from my home computer.