Recording of traditional nursery rhymes: cover or "based on"?

I’m unsure about how should I handle this. I’ve added some releases to MusicBrainz that are recordings of traditional Brazilian nursery rhymes.

Since they are traditional songs, the lyrics and arrangements are unclear. Most people know by heart the main melody, but beyond that there are a lot of variations. Some songs I’ve learned a version in my childhood that is different from what my wife learned, for example.

Also, some recordings add intro that don’t exist on the original song. Since they are sung by children when playing, there aren’t any instrumental intros originally.

This is an example of something I added, and I added relationships to new works based on the originals to every song to reflect the arrangement, but I’m unsure if this is correct (or even needed).

I’ve searched in the forum for this question. I found this, but they are not handling exactly the same problem as I: Derivative works (mainly VG): Cover recording, or arrangement? - #6 by Silver_Skree

So my question is: when I’m adding a recording of a traditional nursery rhyme like these examples, should I create a work based on the original traditional song indicating the writer/composer of the adaptation, or should I only add as a cover recording?

EDIT: Clarity

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It is like UK folk music. Old originals written long in the past. Passed down via word of mouth. Original creation is unknown. People could not write back then.
So all MB can do is link them as best as possible while adding annotations explaining those links.

Your adding these and linking them is a basis for other people to work from. Also try and add some aliases for alternate spellings and titles.

Leaving good notes in the annotations will help other people in years to come. Edit notes can soon be hidden by multiple other edits in the edit history.

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I’d possibly use “arrangement” if it’s still mostly the same song but in any case, if you have new writers, having a new work makes perfect sense.

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