I was looking through some books for a thread in soc.culture.welsh and came across something which reminded me of this discussion.

In the Journal of the Welsh Folk Song Society, 1910, Vol 1 Pt 2 there's a footnote under Hen Wr Mwyn (a Welsh *Henry My Son*) as follows...

--This suggests the song 'I will sing you one, O!' For versions of it see 'Come I will sing ou' in English Country Songs; 'The Dilly Song'.....: also 'Household Tales' by addy ('Two Pagan Hymns') and the Breton tune, 'Ar Rannou'--

The music for Ar Rannou follows this entry, but that's all I've got on the Pagan Hymns ...

sian