Many Thanks to all for your comments and advice. I did a search in the forum for the two songs from my original question. I was surprised (can you tell I'm a newbie?) to find very extensive and useful information. Now I'm too embarassed to tell you what the songs were, and besides I don't want to re-open those threads :-)
We'll certainly be more diligent in seeking out authors in the future (and maybe take another quick look at our already released CDs).
Let the discussion continue! It's very interesting and informative.
Snooz