A very mysterious and unusual song with a reggae-like percussion driving it, originating from from the Kid A/Amnesiac sessions, “Fast-Track” first appeared as a B-side to “Pyramid Song”, appearing on CD2 versions of the UK single, along with the Japanese and European maxi-CD singles. The track also appears on the UK and French 12" releases.

Because of the song’s esoteric nature and unusual atmosphere, the song has in particular garnered a reputation among fans as one of the band’s more eerie tracks.

Although the band has rarely – if in any known interviews at all – talked about “Fast-Track”, an entry in Ed O'Brien’s diary (taken from the Citizen Insane website), dated October 6th, 1999, offers a lot of information regarding the song:

Start [sic] working on a band loop called ‘Fast Track’ – Thom did a rough arrangement on Cubase last night. Nige and I then do some guitar sounds using my new toy – the first Roland guitar synth, which sounds pretty different. Jonny does a couple of (?) radio tracks. We then do a bit of editing and pruning. Nige is really into this thing of throwing down random shit and then simply keeping the really good stuff. It’s a cool way of writing, if only because you end up with things that you couldn’t possibly contrive to do.

Interestingly, a drawing from Stanley Donwood’s 2007 picture book Dead Children Playing also references the song’s name: