There is none.
The key is in the embedded meta tags. Plex requires you to use the Album Artist tag (which is a separate tag than the regular Artist tag)
- It must not contain more than one name. Which means with collaboration-type albums, you must decide which artist shall be the “main” one. Then tag only this name. For traditional sampler-style albums, there is the special artist name “Various Artists” that you can use.
- All tracks of one particular album must have the same Album Artist tagged (each track can have a different Artist tag)
- You must use the folder structure “Album Artist” > “Album Title” > [Tracks]
- All albums which are stored inside one particular “Album Artist” folder must have identical content in their
Album Artistmeta tags.
Use a dedicated meta tagger app to set the Album Artist tag. The file properties tab of the Windows file explorer is inadequate.
I recommend mp3tag. It can help you with turning folder names into tags, or vice versa, generating folder structures and file names from meta tags.
Picard is writing the Album Artist tag by default. (But it won’t stick to the “one artist only” requirement)
If you let it, it will also create the right folder structure.
See [HowTo] Music Organizing with MusicBrainz Picard for a few pointers.
As last step, enable “prefer local meta tags” in the properties of your music library.
Then perform the Plex Dance light (meaning you can omit step 4) with all artists and albums which are currently mixed up.
If most of them are affected, it is probably easier to scrap the whole library and create it anew in Plex.
Tip: if you are adding a lot of music at once, you should (at least temporarily) disable all the music-related analysis under Settings - Library
