Album art the same if album artist field is the same-any way to avoid this?

Technically the Album is different if the Album Artist field is different (you are right of course) but that is not the point here. I am trying to achieve a desired result. A combination of different artists songs put together as a compilation and named as an "album" (using iTunes terminology, even though it is not a real album.)

Here is a made up scenario to make sure the situation is clear - Consider 3 songs one by Prince, on by Beyonce and One by Jay-Z. - Now I take the one song from each of them that I want to group together and make it compilation and call an album, called "Wild Combination" or whatever ). There is different artwork for each song obviously (art from its original album or single). Well - I want to see that individual artwork when a given song is playing, not the same artwork for all songs in the "album". Right now, iTunes picks one of the songs and shows the same artwork for all three (i.e. it may be Prince playing but a picture of Jay-Z showing up in coverflow - by the way, the Now Playing box always shows it correctly or the way I want it, coverflow does not and Apple T.V. does not). In the above example the Album artist field is blank.

Partial fix - If you enter an Album artist into that field (i.e. a unique name in the Album artist field for each artist then the individual art shows up in coverflow). If the Album Artist field remains blank it reverts to showing a single art for all songs. If there is some generic text in all three fields (i.e. non-unique, easily filled in generic text) then the art shows the same for all three songs.

The question again, is how to make the individual artwork show up without entering unique text in the album artist field (imagine not 3 songs but 500 hundred or 5000 songs with this problem, unique entries is a no-go). Hopefully that clears up the situation.

Regarding your question about the sort of the art - I have both scenarios but for the sake of this question, lets assume the art is in the song file itself.

Any assistance will be greatly appreciated?

Here is the only brute force solution I have been able to come up with. Pick the most popular artists, start from most popular to least popular and type their names into search field and then auto-populate the artist name in the album artists field for anything they appear it (perfect - no, because even if they are a guest they will be listed as the "primary" album artist). Move on to the next most popular and so on and so on and eventually most of your album artist fields are filled in with a most likely unique name on those albums were it matters. That albums where it doesn't matter (i.e.. the ones that are just one artist will probably still be ok because all songs had the same album art anyway.) The theory is this will get you about 50% - 65% successful in getting the required (unique names) in the album artist field which will make the individual album art show up. Its not great but it is better than typing them individual into a library of 4000 or 20000 songs. If anyone has some other idea about how to populate the album artist field with unique text of any type - please say so. I really don't care if it is 1-4000 or 1-20000 (i.e. just a series of numbers), as long as they are unique they will serve the required purpose. I just don't want to type them in one at a time. Thanks for any help! Another less brute force solution is welcome but I am willing to go for the barbaric solution at this point.