believe Villemarqué melody given Ar Rannou older than Goadec

I have a question regarding the correct melody for the old Druid number tutorial, Les Series or Ar Rannou or Gousperou ar Raned. Villemarque got his melody from a young peasant of the parish of Nizon whose mother had taught it to him (« to form his memory ») and published it in his Barzaz-Breiz 1845. Some have attacked the authenticity of Villemarque over the years, but the fact that his journals indicated he did indeed know various Breton dialects well enough to collect these old songs and the story of this one in particular (Les Series/Ar Rannou), along with my gut feeling as a musician about the score he wrote presumably from hearing the young peasant sing it to him, tend to make me believe the melody he published in 1845 is likely closest to old Celtic melody that would have originally been known pre-Christian era in Brittany/Wales/Cornwall. It is given in the key of Bb, appearing to be used as the G minor scale (the relative minor of Bb) in the song melody given. I know the lyrics/thoughts have survived the 20 odd centuries embedded in a number chant, a not uncommon way for the common people to keep alive complex history and thought without writing, i.e., the lyrics given do seem to be Druid era thoughts and memories. I’m thinking that c. 100 BC, for example, there may have been Druid singing accompanied by ancient Celtic harp or lyre, something with 6 strings (like the one found at the 600 AD Anglo Saxon burial site at Sutton Hoo) or maybe a few more, likely tuned to a G pentatonic scale, G A B D E, with a melody being free to hit a C or Bb to make the Ar Rannou melody alongside, or with those strings or tunings added, etc. I was surprised to hear the Goadec Sisters singing Gousperou ar Raned (which appears to be Les Series/Ar Rannou) in Bb with an entirely different melody though, one which does not sound ancient Celtic to me, but rather later French nationalist if you will. So my question (long winded though I am, surprising as I am a string player myself, guitar, grin) is whether you have noticed this difference in the melody applied to Ar Rannou and whether you believe the Villemarque melody is more likely correct, i.e., historically more ancient. I note that One Shot (the French Celtic fusion/jazz band) used portions of the Villemarque melody in their live rendition of the song (very nicely done, though departing from the original after a brief nod to the first line or so) as fusion jazz.

So, any light you could shed on my question about the melody and what you might know (and I imagine you know a lot) about what kind of harp would have been around Brittany/Wales/Cornwall 2 thousand years ago and its likely tunings would be appreciated. Thanks!

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