Is there a way to deny MusicBrainz the ability to put anything, and I mean anything, into a compilation album?
The DB that MBP is using has obviously not been cleaned, or people actually like to have their music un-categorized. When even big artists like Aretha Franklin, Beatles and god knows what gets put into compilation albums then something is obviously wrong. I’m pretty sure every song ever released was first released on an album or single by that artist, not directly to a compilation album (obviously barring orchestras and big-bands like James Last and the likes).
Under metadata I have moved the sliders for everything other than album, single and EP all the way to the left, the 3 mentioned are moved all the way to the right.