The lost art of the concept record

It's not that no one is doing them anymore, but maybe they're not as common as they once were.

What are some of your favorite concept albums, what was the concept, and why is it a favorite?

The most recent ones I can think of are Eminem's The Death of Slim Shady (Coup de Grâce) and The Arctic Monkeys' Tranquility Base Hotel & Casino

I found both of these to be exceptionally well-executed and unique among the modern record efforts of both hip hop and rock and roll. My wife and I quote songs off the TBH&C record all the time.

I'd love to listen to more records like these. Kendrick had an all-time great with Mr. Morale too.