to start:

Deltron 3030 was already mentioned

'ziggy stardust'

Bjork's Medulla was a musical concept: "all" of it is vocals (not really, but something like at least 90%)... maybe this should have gone in your novelty song topic with a question mark, ha ha

Nine Inch Nails - Year Zero (dystopian future)

Nine Inch Nails - The Downward Spiral (http://www.4degreez.com/nailz/ninterpretations/downspiral.html)

J Dilla - Donuts (the concept is subtle--you have to pay attention to the song titles and sample sources and contrast it all with his life--but present; happy birthday and rest in peace)