In advance of the upcoming 4.6xx update on stable, I am trying to hoover up some of the known issues with tagging in my music library (I know I should have done these ages ago, but I have thousands of tracks and some stuff I ripped ages ago I didn't do a great job with and there's never enough time). Anyway, as part of this - I wanted to check the Wiki to make sure I was using the correct naming structure.
There is nothing in the Wiki regarding naming multi-part music albums, althugh there is for the videos. I tried the advice there using albumname-cd1/tracks and albumname-cd2/tracks under artist/albumname/ and that created each disc as a separate album. Revert back to CD1/tracks and CD2/tracks under artist/albumname/ and they are back to single album with two discs. Attached images show what I mean