Screenwriter Jimmy McGovern talks about his new BBC drama, Common, which was inspired by a letter from a mother whose son was imprisoned under the controversial Joint Enterprise law. Tony Hatch, composer of TV theme tunes for Crossroads, Neighbours and Sportsnight, looks back over his career and the hits he wrote for Petula Clark, Scott Walker and The Searchers. Amanda Hopkinson reviews a new Royal Academy exhibition, Radical Geometry, which focuses on art produced during a 50-year period in distinct parts of South America, and Ryan Gilbey reviews The 100-Year-Old Man Who Climbed out the Window and Disappeared, a new film adapted from the novel by Swedish author Jonas Jonasson. And as Ed Sheeran's album X - which is pronounced "multiply" - reaches number one, David Quantick discusses numbers in music. Show less