This is bad metadata being supplied to Roon by Allmusic. I’ll flag @metadata who will sort it out. It’s one of the quirks of Roon that if it has identified an album, it is very difficult to go against it.
In the meantime, as a temporary fix, if you have adequate file metadata, then unidentifying the album will work.
Goto 3 dots, edit, identify and keep saying no to Roon’s suggestions, until it suggests using file-based metadata. You will lose the album description though.
When Allmusic has fixed the problem, you can identify the album again.
They are not. They are just for classical music (almost) only and thus most programs don’t show them in standard configuration. Every good tagging software allows the user to add any, even user defined, tags at will.
For the question about SongKong, @paultaylor should be able to answer that.
Our metadata provider has let us know that they have corrected this today. Please give this about a week or two to be reflected within Roon. Once you see the change on your end please mark this post as the solution.
Just checked. Something did change, and it looks better, however still not there. Disk 1 is ok - not perfect, but acceptable - top image below. Disk 2 however still screwed up. In the different way than before, but still no good - second image below. First of all, note that all tracks are repeated. This is weird. I checked and each pair is referencing the same file. If I delete one, both are blown away, as the file is deleted.
Then, see how “Symphony No. 9 in D major” interlaces the flow of the tracks. That’s not good.
Perhaps I didn’t wait long enough and more metadata changes are still coming. If so, no problem, I’ll come back re-check in a couple of days.
Look at the timings for the tracks on disc 1. This is one of the (rare?) CDs that makes use of sub-track indices, allowing jumping in to sub-sections of the track. So track 1 (the first movement) is broken down into 8 sub-sections, each of which is exposed and picked up by Roon (or your CD-player).