Jonny Greenwood on BBC Radio 4

Asked why he keeps writing with Thom Yorke outside Radiohead, in The Smile, Jonny Greenwood says it is simply what he has done since he was 14 or 15, and so hard to stop. He borrows Yorke's image of a studio full of canvases in different states of completion, rotated between, always being worked on and never all finished. Little has changed, he says. They are the same awkward and obnoxious teenagers they were 30 years ago.

Of Tom Skinner he says the rehearsals are exactly as confusing as anyone would imagine, and that beyond that Skinner's enthusiasm is addictive and he makes the whole thing sound good. In a trio, small changes alter an arrangement enormously, and everyone is exposed.

The interviewer calls the arrangements architectural and asks how they build something so complex. It does not feel complex to him, Greenwood says. They were schooled by the Pixies, and the lesson was that a song kept under four or five minutes leaves one question, what can be done inside it, with not being boring as the rule.