The term "concept album" is so broad though.

Some would say that a concept album should not only an overarching them, but also a cohesive narrative which runs through it.

Terms like "rock opera" only muddy the waters further.

Anyway, another album which comes to mind is:



And this



And a couple of Ween albums, but off the top of my head i can't really remember if any of them are at all cohesive. I'll have to re listen and report back.