I've been contributing to Musicbrainz for years and I highly recommend it. I use the "Beets" client to automatically tag my library (and occasionally "Picard" to manually clean up mismatches) and it works really well.
Musicbrainz is amazing but the problem is that musicbrainz is about attaching metadata after a track and underlying song has been released.
The structural problem is about capturing and attaching metadata before that recording of a song is ever heard, and ensuring the metadata flows through the digital value chain, and then out with the revenues trust result, through the royalty chains.
Wikidata's benefit is that it's public and verifiable without special software.
All the complex cases in the article can be captured (though Wikidata has, at best, a shaky set of schemas for how any given data is represented).