While Spike's statement is true, setting the [Artist] field to two different artist names will NOT make that album appear twice in the Artists view. I just tried it thinking it would work; it does not. This is because the Artists view uses the value of [Album Artist (auto)] as it's first category. It ignores the [Artist] field.
If you make a new Artists view that uses [Artist] as the first category, then this technique works and shows two albums from two artists. One under each Artist.
Unfortunately, a view like that is rather UGLY. Because it shows you every single artist on every compilation album, every multi-artist song on every album, etc. Mine has dozens and dozens of duplicated album covers from things like "hits of the 80s".
If you can live with this clutter, then this solution definitely works. I'm not sure of a more elegant way to do it.
Brian.