I really love these "words videos" for songs ... they're brilliant for learning the songs for a start, they're a big help with pronunciation too, and they can often surprise you when you find out that what you thought they were singing actually isn't that at all. Eeek.
However , with Welsh, not many bands seem to do it ... and there doesn't seem to be much " fan video" activity... where fans of the band make their own words videos for songs. I've even done it myself in various crude but effective ways.
But there are some .. and the Al Lewis Band is a good example ... so I'm going to assemble a collection of theirs..... all the ones I can find anyway.
[1] Hanes yn y Lluniau