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Last year The Guardian ran a series of scoops about the extent of mass surveillance by the security services here and in the USA. Anne McElvoy talks to the journalist Luke Harding about the inside story on the whistle-blower Edward Snowden and what motivated him to commit one of the biggest intelligence leaks in history. The former director of GCHQ, Sir David Omand, fears the leaks have done untold damage and endangered state security. Claims that America hacked the phone of the German Chancellor Angela Merkel caused uproar in Germany, and the journalist Annette Dittert argues that the memory of the Stasi's spying machine is still raw. There has been little outcry among the British public and the philosopher Alain de Botton explores the nature of news and the 'noise' it generates. Producer: Katy Hickman.

Tom Sutcliffe talks to the celebrated composer, Sir Peter Maxwell Davies on the eve of the premier of his tenth symphony. His latest work creates a musical structure based on architectural proportions, inspired by the 17th century architect Francesco Borromini. Waldemar Januszczak turns to the 18th century and Rococo for his inspiration, and looks at how this artistic movement spread from painting and interior design, to music and theatre. The environment, both built and natural, is key to Trevor Cox's study of sound as he listens intently to the cacophony around us. While the psychologist Victoria Williamson explores our relationship with music, including why we're prone to earworms, certain rhythms repeating endlessly in our heads.Producer: Katy Hickman.

Tom Sutcliffe talks to the neuroscientist Dick Swaab who argues that everything we do and don't do is determined by our brain. He explains why 'we are our brains'. The philosopher Julian Baggini doesn't dispute the pre-eminence of brain processes but believes it doesn't tell the whole story. As a writer Helen Dunmore must get into the minds of her characters - the latest a war-damaged soldier from the trenches. Natalie Abrahami only has the heads of her characters to play with as she directs Samuel Beckett's Happy Days about the amazing ability of a woman to survive by denying her ever-diminishing world. Producer: Katy Hickman.