The title is a possible refence to MKUltra, a project directed by the CIA to study means of mind control. The track’s atmosphere aims to create the sense of discomfort that relates to the experiment.
[Instrumental]
MK 1 was written by Ed O’Brien & Philip Selway & Colin Greenwood & Jonny Greenwood & Thom Yorke.
MK 1 was produced by Radiohead & Nigel Godrich.