If you are in London near Trafalgar Square at 6:30pm tonight you are in for a treat.  There is a free open air concert being given by the LSO.  For full details see http://lso.co.uk/bmw-lso-open-air-classics. Principal Conductor of the LSO, Valery Gergiev will conduct an all-Berlioz programme. The aim of BMW LSO Open Air Classics is to bring outstanding music performed in the open air – free for everyone in an informal atmosphere.