Singles
- "Psychological" — In December 2005, a limited 12-inch white label of "Psychological" was released. This one-track promo single featured an instrumental mix of the track, clocking in at 4:05.
- "I'm with Stupid" — the first commercially available single from Fundamental released 8 May 2006 in the UK.
- "Minimal" — released 24 July 2006, "Minimal" was announced by the Pet Shop Boys on 6 May as the second commercially available single from Fundamental in the UK.
- "Numb" – released on 16 October 2006, announced on the official website on 4 September.
- "Integral" – a new version of this song was released to promote the album Disco 4.
Read more about this topic: Fundamental (Pet Shop Boys album)