Love a good concept album, some of the best.
Queensryche - Operation Mindcrime Killer album themes taken strongly from Orwells 1984 in sort of a big brother-esque dystopia where a man is used and framed for killing the only women he loves
W.A.S.P. - Crimson Idol The story of Jonathon Steele just an amazing story, Blackie Lawless is an incredible story teller. Really emotional story that deals with loss and that old saying of be careful what you wish for. A son who feels invisible to a father who blames him for his brothers death. Runs away and tries to make it in the music industry. It's also a commentary on the corporate music industry as a whole.
Savatage - Streets The story of a drug dealer in NYC who becomes a rockstar and his fall from grace then return to the spotlight.