Bill, you're asking two different questions:
1. Why is my CD split into multiple albums and how can I fix it to show as one album?
2. How can/is/should Artist, Composer, Performer, Soloist, etc, metadata organized in digital music files?
The answer for #1 is pretty easy: In JRiver MC, any compilation CD with multiple artists will get broken up into multiple logical albums. MC's fix for this is to tag all of the songs from that CD with the "Album Artist" tag. This tag is an override. Your Artist tags stay as they are, but the Album Artist tag is used simply to group all of these songs from the same CD together. A common entry for Album Artist is "(Multiple Artists)" , or "Various". Either one will group them all together as one album so it looks as you expect.
To do this, select all the songs from the album in question. Then select "Tag" (right click and click Tag). In the Tagging Pane on the left, find the entry for "Album Artist". It should be blank. Fill it out as Various or something else and press enter. Done. Your songs should now show as a single album.
Question #2 is a big one. Classical music organization is not standardized. There's a lot of information here on the forum if you do some searches. I know very little about it as I only have a handful of classical titles in my collection.
Hope this helps.
Brian.