Can't fine these lyrics anywhere! The verses I think I know go like this:
O Fairest fair, O fairest fair
Princess most pleasant and preclare (sp?)
The lustiest (one, or babe) that e'er have(hae? ) been
Welcome to Scotland to be ye queen

Welcome the rose both red and white
Welcme the flower of our heart's delight
The spirit rejoiceth from the spleen
Welcome to Scotland to be ye queen.

Song was apparently written on arrival of someone to Scotland to accede to the throne.
Please someone who knows this old song, give me the right words and the reference. Thanks!