Concept album

From Conservapedia

A concept album is an album that has one main theme to it. For instance, all of the Pink Floyd albums from Wish You Were Here to The Final Cut are concept albums. Wish You Were Here is about Syd Barrett and about how the record company does not care about the artist, as long as they can get their money, and The Final Cut is an anti-war album. Similarly, all Roger Waters' albums (with the exception of Radio K.A.O.S.) are concept albums.