There's this one (if it works!)... but I think the tune kinda gets lost in the rendition. Also, there are a WHOLE lot of spelling mistakes in the text... says she who just noticed that she left out a letter above (3rd verse should be "cwpwrdd cornel", although when sung, some people might not actually pronounce the "dd")
Oh, if the BCT doesn't work, it's angerweit.tikon.ch/lieder/folk-kelt/melinydd
sian