4hero - Two Pages
One of my all-time fave albums. The "two pages" are the two discs representing the two sides of 4hero's style: brighter downtempo electronica on the first disc, transitioning into darker and harsher drum and bass on disc two. It also uses the two-disc structure to develop its loose concept album plot involving environmental disaster and aliens.
If you get the chance, I highly recommend listening to the original UK two-disc version. Most streaming services only seem to have the condensed one-disc US version, which cuts several songs and loses some of that contrast between sides of the album that the two discs got them.