The album is mainly a compilation of Pet Shop Boys remixes of songs by other artists, a first among any of their releases to date. It also includes a previously unreleased mix of "Integral" and the maxi-mix of "I'm with Stupid", previously released on the Japanese edition of Fundamental.
The album reached #15 on the UK Compilations Chart and #3 on the UK Dance Albums Chart. This was due to the majority of the album songs being those of other artists, therefore making it ineligible for the UK Albums Chart.
For the promotion of Disco Four, the PSB Perfect Immaculate mix of "Integral" had a limited service to club and selected radio DJs with a music video released on the official website and YouTube. On the day of the album's release, the track was released to digital download services as a normal digital download.