I've checked out Awn i Fethlem (1983) and Wrth y Breseb (1985), both Gwasg Pantycelyn issues, but neither have Mor Bell yn Ol ... probably because both are Rhy Bell yn Ol. OK. Welsh witicism. Couldn't resist. Anyway, I think MByO was later 1980s so ...

Thing with checking with Sain is that they don't hold the rights to the songs in most cases. You have checked with John and Alun so that's OK for their own compositions. In general, most Welsh singers are pretty good at letting people use their work but there are a couple of exceptions who can be (I hear) quite litigatious. (How do you spell that?)

Generally, I fear that I won't be able to help with pop songs or singer/songwriter stuff as I just don't listen to them or own the recordings. And, as you say, they aren't in print and I don't suppose they are really intended to be particularly long-lived. Pity in a few cases ...

sian