Meredydd Evans is someone else I used to see at the Pan Celtic Festival when it was based in Killarney many years ago. I remember him sitting in the lounge of Scott's Hotel and singing some of his vast repertoire of songs.I think I have only recording of him singing - that's on a compilation issued by Recordiau Sain. Trying to think of it off hand, I think it was a (short) version, and not the usual one, of 'Oes gafr eto' etc.
If you have any information about recordings made by him, I'd be interested to find out.
Gyda cyfarchion,
Bobby Bob