There's a more complete (and accurate?) version of Can Y Melinydd at
http://www.caneuongwerin.co.uk/canymelinydd.html

Fliss, there are lots of great Welsh songs at Caneuon Gwerin, and hymns and Christmas carols at a related site - with midis for a lot of them.
Do you sing in Welsh? It's a great way to practice the language.

Chris in Portland