The London Symphony Orchestra and London Symphony Chorus under Gianandrea Noseda, with soprano Sabina Cvilak, tenor Ian Bostridge and bass Simon Keenlyside, perform Britten's 'War Requiem'. (A change of conductor –Sir Colin Davis has stepped down for health reasons. Note: at 6pm, a pre-concert performance by Guildhall Artists at the Barbican Hall. Britten songs are performed by Sky Ingram (soprano), Ashley Riches (baritone) and pianist Catherine Norton; free.