Create Digital Music has two pieces on the making of Doctor Who's theme song. The second is an introduction to Delia Derbyshire, who is considered to be the "woman behind the men" behind the notability of the song. She pioneered techniques of synthesizing sounds, sampling and looping in the sixties. One WFMU blogger waxes on about Delia, who "was an inspiring collaborator" working behind the scenes of the BBC's Radiophonic Workshop. BBC Four produced a documentary about the workshop called Alchemists of Sound which aired in 2005, ten years after the workshop closed due to budget cuts.