I store a lot of albums (wav, ape or mp3) on ONE disk. I believe many of you also do same way. So would be great to have 'top hierachy' field not album - but 'media name'.
In case of ordinary CD, vinyl - it may be filled automatically with CD Label or some combination 'artist+title', in case of 'multi-album' disk it can be filled for ALL albums with CD label or typed manually.

Also this field may be used for sorting, locating media files and statistics - number of 'real disk' - not albums.