The steadily approaching centenary of the First World War will be widely commemorated in music, but few events are likely to match the thoughtfulness of Steven Isserlis’s year-long series at the Wigmore Hall. Already this first concert of Music in the Shadow of War was a reminder that, while few major 20th-century composers were actually unaffected by either of the world wars, their responses were all different – as to be expected of figures who ranged from soldiers to pacifists and suffering bystanders.