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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.