Never envy a relatively new voice in music his or her place in a concert shared with Sibelius. Invariably the economical Finnish master will triumph with his ideas and how he streams them in a forward-moving adventure. You sit staring at all the percussion Sibelius never needs, and wonder whether the newcomer will engage it more imaginatively than most of his peers. Which fortunately turned out to be the case with Detlev Glanert's 15-year-old Music for Violin and Orchestra, fearlessly taken on by one of the BBC Symphony Orchestra's two world-class leaders, Stephen Bryant. But given Principal Guest Conductor David Robertson's urgent, sensuous way with Sibelius, the German's flickering homage to the Orpheus of Rilke's sonnets still hovered in the shadows.