Iron Maiden 'Piece of Mind'. It's better when you're high, but that could be said about most any album. Still damn good even if you're not. It's not a concept album, because it doesn't tell an ongoing story from song to song but each song does tell an individual story. For example, my favorite - 'Where Eagles Dare' - is about Allied paratroopers on what's basically a suicide mission during WWII to rescue an American General being held prisoner by Nazis in a castle high in the Bavarian Alps. Phenomenal song. Another great one, 'To Tame a Land', was written about the movie Dune. And of course, 'The Trooper' which was written about Charge of the Light Brigade. Those are just a few. I feel like I'm not doing it justice by leaving out other great story songs like Revelations, Flight of Icarus, etc etc.