If the tags are the same (album artist (auto), artist, album, year) AND they reside in the same parent folder they will be considered one album
I think you also have to sequentially number the tracks (Track No), and set the same the Disk N of M tags too.
I think you guys are mixing two things together here. For MC to display an album as a single entity, it just needs the same: Album, Album Artist (or Album Artist (auto) ). That's it.
As a test, I just changed track #1, disc #1 of The Best Of The Doors to Track 100, Disc 12, Year 1958. It stayed in the same album as displayed. But it changed position.
Some of the things you guys are talking about with sequentially numbered tracks and the same folder are requirements for MC's algorithm for trying to tell you which albums are *complete*. This does not affect how MC displays tracks in an album though. All it needs are the two above fields to be the same.
For sorting purposes, on a multi-disc set, you absolutely want the track numbers to be correct, and the disc numbers to be correct. Though total discs is not used for sorting as far as I know.
Brian.