Based on this thread:
https://community.metabrainz.org/t/several-questions-requests/553294

Here is the list of production music sites that could use link autioselection feature both for "license" or "discography entry" (i suppose their primary function is licensing, though they also provide detailed tracks info and metadata).

links to certain library (could be treated as artist) information:
https://www.apmmusic.com/libraries/*
links to certain album information:
https://www.apmmusic.com/albums/*

links to certain library (could be treated as artist) information:
https://www.universalproductionmusic.com/en-row/discover/labels/*
links to certain album information:
https://www.universalproductionmusic.com/en-row/discover/albums/*

links to certain library (could be treated as artist) information:
https://milesofmusik.com/music_catalog/library-*/
links to certain album information:
https://milesofmusik.com/music_catalog/album-*/

links to certain library (could be treated as artist) information:
https://www.musou.gr/music/browse/*
links to certain album information:
https://www.musou.gr/music/album/*

links to certain library (could be treated as artist) information:
https://www.extrememusic.com/discover/labels/*
links to certain album information:
https://www.extrememusic.com/albums/*

links to certain library (could be treated as artist) information:
https://app.bmgproductionmusic.be/labels/*
links to certain album information:
https://app.bmgproductionmusic.be/carrier/*

https://www.sourceaudio.com/
This site is the home/platform for many labels that located on its sub-domain address:
Just a few examples:
https://ghostwriter.sourceaudio.com/#!labels
https://imaginemusic.sourceaudio.com/
https://positionmusic.sourceaudio.com/#!albums
https://secession.sourceaudio.com/#!albums
Depending on certain label info on the *.sourceaudio could be available for public or private (in this case site requires a login).

Also i suppose some lables use site infrastructure that very similar on sourceaudio. Cant say if its the same site or not.
https://search.musicforproductions.com/#!labels