Three great-great-uncles of composer Gareth Farr were killed in the First World War and are buried in France and Belgium. His family's loss, and the deaths of all the men and women killed during the war to end all wars, are woven into Gareth's new Cello Concerto. Chemin des Dames will have its premiere with the New Zealand Symphony Orchestra next month, and in September it will be performed in France. Lynn Freeman asks Gareth about this new work and about the personal story behind it.