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2013 marks the 150th anniversary of the London Underground, and to celebrate this illustrious milestone, Twenty Minutes explores the lesser-known music of the tube - not just the buskers and the classical music in ticket halls, but the strange music of the machinery involved in the world's first underground railway. Train enthusiast Petroc Trelawny experiences the compelling and sometimes overwhelming soundworld of the tube, with writer Jonathan Glancey and Robert Elms.