How to get all artists & songs from a compilation album to show up together?

@gmorris001 said:
In my music library, I get an “artist” called “various artists”. In here, this album shows up, but with only 1 song. The rest of the songs are under the individual artists. How do I, say, group them all together?

Various Artists (or ‘sampler’) albums need to have Various Artists in their embedded metadata as the AlbumArtist.
This is a different tag than the ‘Artist’ !

Proper folder structure and file naming helps Plex to keep the files together

Music /
   Various Artists /
      Various Artists - The Best Tracks of the 30s /
         Disc 1 /
            1. trackartist - tracktitle.mp3
            2. trackartist - tracktitle.mp3
            ...
         Disc 2 /
            1. trackartist - tracktitle.mp3
            2. trackartist - tracktitle.mp3
            ...