What I really want for Discogs is some kind of database feature, recognising that unique tracks make up releases.

So all the individual credits for e.g. the song "The Boys Of Summer" by Don Henley could be updated in one place, and then updated on all the releases it appears on.

That would make the site extremely useful to see who played what on which songs, who produced and mixed it etc.

You CAN find that information for songs now, but since a track might appear on hundreds of releases, it's impossible to know easily which release has the credits for it.