Guitarist's third film score drops on March 7
Frontman teams up with 350 Earth campaign group for project
Wagner, One Direction, Mary Byrne and co to sing rock numbers
Radiohead artist Stanley Donwood is working with Yorke on project
Jonny Greenwood says band 'haven't quite finished' the record
Duo have given over 'weird ambient stuff' for Edward Norton
Drummer Phil Selway admits 'it's all up in the air at the moment'
Bands take part in new video
Bassist Colin Greenwood also explains that the band have 'begun to wonder how to release them'
Band get involved in free 'by the fans for the fans' concert film