When I was a developer on MusicBrainz (2010-2013) we didn't have access to any industry data sources. Some of our customers did though, and wanted to feed that

When I was a developer on MusicBrainz (2010-2013) we didn't have access to any industry data sources. Some of our customers did though, and wanted to feed that back into the MusicBrainz database. When we took a look at that data, it turned out that it was pretty messy, and couldn't be used directly. We discussed storing that data separately, and building a tool so users could easily import from it -- so it could be verified and cleaned up by a human before becoming part of the database. I don't remember if that ever got built.