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Radio 4's Mastertapes returned for a third series last week, with John Wilson talking to musicians about a career-defining album in front of a live audience. The series began with Robbie Williams discussing his debut solo album Life Thru a Lens. But would the programme be more at home on a music network like Radio 2 or 6Music, rather than Radio 4? Roger Bolton talks to the series producer Paul Kobrak about the place for a programme like Mastertapes on a speech network.When Any Questions visited the historic Chartwell House for last Friday's broadcast, presenter Jonathan Dimbleby was cut off just as the programme began, only to return seemingly on the telephone. And later in the week, James Naughtie was oblivious that he had dropped off the air for twelve seconds during the Today programme. Is Radio 4 the victim of sabotage or is there a ghost in the machine?There is a takeover happening at the Beeb - some lucky listeners will be invading studios, cropping up as the voice of 'Previously on PM', and even visiti