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On Start the Week Tom Sutcliffe picks through the remains of vanished buildings with the writer James Crawford. In his book, Fallen Glory, Crawford looks at the life and death of some of the world's most iconic structures. The conductor Semyon Bychkov explores why some music fades, and the enduring appeal of Tchaikovsky's Eugene Onegin. Julia Sallabank studies endangered languages and whether it's possible to revive indigenous languages on the verge of extinction. And it is origins which feature on Peter Randall-Page's latest sculpture: a naturally eroded glacial boulder carved with stories of creation myths from cuneiform to text speak. Producer: Katy Hickman.