Many classical albums include more than one composer. If you show this by entering "Various composers" via the arrow to the right of the composer field, "Various composers" does not then appear in album view. If you actually key in "Various Composers" as the composer, it does, of course appear. I deliberately gave composer a capital C here to distinguish this mode of entry from the other one.

I did a check to see if I had forgotten a composer entry for any classical CD, by searching for classical/composer/is empty and it showed all the ones with "Various composers" (the ones which I had entered by clicking the arrow) as well as a few that were actually empty because I had omitted to enter anything. Isn't there a bit of an anomaly here?