Your favorite 'concept' album

Rick Wakeman’s Journey to the Center of th Earth. In fact, I think I’ll put it on right now...  Or rather, after Morph the Cat by Donald Fagan.  Which, despite the name, isn’t a concept album. Just a good album. 

Alan Parson Project--you pick.

Rick Wakeman - Six Wives of Henry VIII

Red Headed Stranger, Pet Sounds, Sgt. Pepper's Lonely Hearts Club Band, Joe's Garage, Rust Never Sleeps, Welcome to My Nightmare, The Band, Hank Wilson's Back, The Delivery Man, Tarkus, Preservation Act 1 and Act 2, Stop Making Sense to list only a few I can think of immediately.

Then you have albums like Copeland: The Music of America that contains pieces that are all related and become a concept when they are put together and listened to in the album sequence.

I guess it depends on your definition of concept album.

Rush 2112