Gruppen review – LSO's artful three-way split enthrals Turbine Hall

Tate Modern, LondonIt was concert as surround-sound art installation: Simon Rattle triumphantly filled Tate’s giant gallery space with the ringing beauty of Stockhausen’s three-orchestra spectacleKarlheinz Stockhausen was no stranger to writing music that turned a performance into an event – this, after all, is the man who wrote music for a string quartet playing from within four helicopters. The importance of making concerts into events is something that Simon Rattle has broug