I am a child of the 70s and listen to the old "concept albums".........I think of them as a single composition...........I never get tired of the following :

PINK FLOYD
Dark Side of the Moon
Wish You Were Here
A Momentary Lapse of Reason
The Division Bell

YES
The YES Alibum
Fragile
Close to the Edge
Relayer

RETURN TO FOREVER
Where Have I Known You Before
No Mystery
Romantic Warrior

KING CRIMSON
Larks Toungues in Aspic
Red

Dream Theater
Scenes From a Memory
6DIT

PORKY TREE
In Absentia
Deadwing

IQ
Frequency
Seventh House

UK
UK

OSI
OSI

and dozens of others.................