I was wondering about the case when a song is based on a poem. For example, https://musicbrainz.org/work/e3281516-6d24-43f3-a4e5-3fe7705a9ced is based on https://musicbrainz.org/work/4124791f-d95a-43b0-8e5e-99301abad698
Do we consider it mandatory to create a separate work for the original poem, or is simply adding the poem’s author as a lyricist of the derivative song sufficient? I think it’s nice to have the relationship to the original poem, but OTOH MusicBrainz is a music database, not a poetry database.
Also, is it correct that the author of the poem is related to both the original poem (as writer) and to the derivative song (as lyricist)?