Music
Rex Features
The track was leaked on the web last week, with elements of the file's source code leading to speculation about a new digital EP from the band.
Writing on the group's website, guitarist Jonny Greenwood said: "We've been recording for a while, and this was one of the first we finished. We're pretty proud of it.
"There's other stuff in various states of completion, but this is one we've been practising, and which we'll probably play at this summer's concerts. Hope you like it."
Radiohead released 'Harry Patch (In Memory Of)' for £1 earlier this month, with proceeds donated to the Royal British Legion.
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