Your favorite 'concept' album


I'm not a concept album fan, however there are a few I've gone down the rabbit hole with. My personal fave, is '10,000 Years' by The Honeydogs. The backstory & lyrics are so vivid, and futuristic, it never fails to reveal something new to me. Even the bandleader said at times he's not sure what it's about.

Fascinating info & interview in the url. Check it out! 

Any others? 
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Jethro Tull - A Passion Play (Thick as a Brick - part II)
Genesis - Duke

Beatles- Sgt. Pepper
Bowie- Ziggy Stardust
The Kinks are the Village Green Preservation Society
Frank Zappa- Lumpy Gravy
I’ll echo the votes for Queensryche, including the Empire album. The Wall is also a favorite. 
Sgt. Pepper - can you imagine if Strawberry Fields and Penny Lane had been included as originally intended? 

2112 - Works even better than Sgt. Pepper as a concept album. 

I can't possibly include The Wall when it comes in 4th behind Dark Side, Wish You Were Here, and Animals as my favorite Pink Floyd album.
Almost forgot the one regarded as the first concept album until I spinned it earlier.
Pretty Things
S.F. Sorrows (1968)
Still sounds great today!