Anne Geddes Gilchrist. The 16th century reference is principally to the single line quoted in The Complaynt of Scotland, as I've said; about which we know no more than that it was in the characteristic metre. Miss Gilchrist further touched upon the subject in a paper, 'Sacred Parodies of Secular Folk Songs: A Study of the Gude and Godlie Ballates of the Wedderburn Brothers' (Journal of the English Folk Dance and Song Society, vol III no 3, 1938, pp 157-182). There, she refers to a sacred song in the same metre, All My Lufe, Leif Me Not, printed (and presumably written by) the Wedderburn brothers in their book of 1567. The Complaynt of Scotland (1549), incidentally, is attributed to a man by the name of Vedderburn, and there may be a connection; but so far as I know that is not proven. She quotes one verse, which she sets to the Germanie Thomas tune from Balfour:

All my lufe leif me not,
Leif me not, leif me not,
All my lufe leif me not this myne alone
With ane burding on my back,
I may not beir it I am so waik,
Lufe, this burding fra me tak
Or ellis I am gone [I am gone,]
Lufe, this burding fra me tak or ellis I am gone.

The little that I have seen of the Godlie Ballates suggests that the rest of the lyric is likely to be long and turgid. At some point I will need to consult that book again (reprint of 1897) for something else, and will try to remember to copy the relevant pages. Meanwhile, you should consult the Gilchrist and Bronson articles.

I think that your references above should be to The Journal of the Welsh Folk Song (not Folklore) Society. I've provided a link to the second one in your other thread