In the second of his five BSO programs this season, Christoph von Dohnányi leads Gustav Mahler's inspirational Symphony No. 2, Resurrection, with Swedish soprano Camilla Tilling, British mezzo-soprano Sarah Connolly, and the Tanglewood Festival Chorus. Mahler composed this five-movement work over several years, making a number of major changes along the way. The third movement is a setting of "Urlicht," a poem from the volume Des Knaben Wunderhorn, which was a significant source of texts for Mahler's songs. The finale's second half is a setting for chorus and soprano of Klopstock's poem Resurrection, which Mahler had heard sung at the funeral of his colleague Hans von Bülow.