I am growing increasingly impatient with "Collectors" claiming copyrights to everything that they can get their hands on. I am and always will be a huge fan of "The Clancy Brothers & Tommy Makem" (Just one example) but well remember, as a very young man, discovering that they had laid claim to every Irish & even Scottish song that they could get their hands on with the old "Arranged and Adapted by ..." angle.
Thirty years later and I'm still tripping over this stuff. Not just with the aforementioned artists either.
Translate a song from Gaelic. Play with it to make it rhyme and you now own it? Please!! That's not songwriting.
Music is for sharing!