Opens with a repeating piano loop and features complex rhythms and a flugelhorn arrangement by Jonny.
Radiohead experimented with a turntable and vinyl emulation software to sample and manipulate music they had been working on, using sampler software written by Jonny.
Thom likened the process of editing and arranging prerecorded sounds and ideas to editing a film.
Ed said: 'Music came first, then the lyrics, and the melody came after. So we had blocks of music and then Thom would write a lead vocal line melody and lyrics to it.'
In 2012, he told Rolling Stone: 'The brick walls we tended to hit were when we knew something was great, like Bloom, but not finished. We knew the song was nearly something. Then Colin had that bassline, and Thom started singing. Those things suddenly made it a hundred times better.'