It’s rare they have any, but, as @chirlu says, I generally not take the arrange relationship from JASRAC / SACEM / etc.
Those only rarely credit arrange (公編), it’s a minority.
Isn’t it a minority in GEMA as well ?
I mean outside of classical works.
I am not against all work arrange relationships, I just mean it’s a minority, it’s usually more related to recording and attaching them to work is usually a mistake.
Oh but OK for your speciifc example, according to JASRAC it’s a Scottish traditional/folklore.
In those cases, arrangements can have their importance, like additional composition in a way.