Now that I have the Discogs import script working (had to create an account there and login) I tried to add https://www.discogs.com/Linda-Ronstadt-Her-Greatest-Hits-And-Her-Finest-Performances/release/14126072
It says it already exists with Reader’s Digest Music and Warner Special Products and that catalog number.
So I searched for those two labels, and also the Reader’s Digest (no Music) link it gave me and… Nope. Not on any of the pages for those three labels. Warner Special Products pages show a lot of OPCD- numbers but no 6506 that I could see. Mostly Various Artists compilations, no Linda Ronstadt.
Suggestion: Make “This label/catalog number pair already exists.” a link to the release that is in the database but nothing tried in searching, nor Picard, can dig up.
Edit: Went back and tried the import again and this time it didn’t lie to me that it already existed, but rejected adding the link to 45worlds, which is on the MusicBrainz whitelist. http://www.45worlds.com/cdalbum/cd/opcd0605
At least it’s finally added, bagged and tagged.