I think I just figured this one out. Looking at a metadata view of the tags, for the whole album, [various] will change for each tract, so cannot be used for album artist if you want to keep it all together. You can only use (multiple artists) if you want them together. If you try to name one artist as the main one, you lose all the individual tract artists, so I don't do that. If you delete the artist in album artist, <enter> then (multiple artists) shows up. [various] needs to be for the individual tract artists at this view. Then you can choose each track, and the individual artist name will show up, or can be placed there. I have only done this backwards, after the album is already in JRiver, and the individual tract artist names are there. Be careful, and make sure only the tracts you want changed are highlighted. The first time I tried to change one album title, I turned all 17 BB King albums into one, thought I had lost all the track titles. Luckily it was not on my main files, so just deleted the BB King folder from JRiver (not my files), then re-syched it to the library and redid it the right way.