Watch our behind-the-scenes film as Esa-Pekka Salonen prepares for a performance of Sibelius's 'choral' symphony, Kullervo, based on a dark tale from the Finnish epic, the Kalevala. Salonen travelled to Uppsala, Sweden to rehearse with the male choir, Orphei Drängar, who feature prominently in the piece. This concert opens the Philharmonia Orchestra's 2011/12 London Season at Southbank Centre's Royal Festival Hall. Click here to learn more and book tickets. philharmonia.co.uk/concerts/25sept11/