I feel like the original Evita concept album is often forgotten in comparison to the OBC (though now that it has a new vinyl issued, maybe that's not the case anymore), but you get the crazy Che insecticide side plot.
A more recent one I really enjoyed was Edge of the World by Ethan Slater and Nick Blaemire. The plot is a little hard to parse out just from the album, though you can get the general shape of it, but I thought there was really great music and character writing in there (also Norbert Leo Butz!)