"Ideas for a large collection of albums...."
I think the new feature I am currently working on will cover this nicely
Not changing tags, and no not using (abusing??) disc sets, because a music disc set is all about a single release with parts, while what Zag wants is more of a generic collection facility for multiple separate releases.
What I am hoping to get in Leia is the ability to filter (create custom nodes, smartplaylists, or use the filter on sideblade) based on music source. Users find it much easier to put music in a folder than edit tags or NFO files, and now that artist art is liberated from having to keep music unique artist folders (containing all the music by that artist and only that artist) there is no reason not to arrange albums phyisically in a folder hierarchy that matches the users use.
Source filtering is a little like making a path rule for smartplaylists, but much more simple. So create a music source that points to all the folders containing the collection - maybe put all the top 500 albums in a folder together (or multiple subfolders beneath a common folder for the collection), or create a multipath source, name it suitably e.g. "Top 500", and then that will be an album filter choice.
In fact, if I can get the necessary GUI changes done, I also want to add an overall music lib filter capability such that picking a source filter then applies to all the nodes - artist, albums, songs, genres, years, other smartplaylists etc., but you won't need that for "Top 500". The db side is joyous to do, but the GUI (a new control on side blade bringing new dialog) is a pain, so if anyone would like to help with that that would be great.
Sound cool? Just a little hint at what I am working on so it may be confusing, but that is why I am quieter than usual on the forum.