Thoughts on the original version of the Holly and the ivy?

The Christmas Carol, "the Holly and the ivy" is well know and you've probably sung it. But did you know the original song was welsh and about new years eve and not Christmas. Christmas was a day of rest and prayer. People kept all the fun stuff until New years Eve.

Here's the original version with translation. About a minute and a half long. Thoughts?

https://youtu.be/Gn_vU75_8fs?si=5r2pWfdieov7qUSg
Thoughts on the original version of the Holly and the ivy?
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