Why not? The song is verbatim from Dewrad, who writes the way he speaks to a degree I haven't seen from any other Welsh speaker--and this is a song to sing sloshed! He's been posting lessons in his dialect to the ZBB if you'd like to have a gander at them.
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llawn, I think: yn llawn daioni. And tecach, and dim ond calon (we'll let "lââân" pass) all ganu.
You're not going to claim dialectal differences here, are you?
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