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Friday marks 100 years since the first day of the Battle of the Somme. Almost 60,000 soldiers were killed, hurt or went missing on that day in July 1916.

To mark that event, an all-night vigil is being held in Westminster Abbey on Thursday.

Organist and master of choristers James O'Donnell explains to James Naughtie how "liturgically and musically" they hope to express the pain and suffering of the battle.

(Image: Westminster choristers. Credit: Dean and Chapter of Westminster)