Susanna Mälkki conducts a thought-provoking program anchored by Gustav Mahler’s Fourth Symphony. This celestial score, which includes a cryptic dance of death, is announced with sleigh bells and a rustic melody that ends with a child’s view of heaven, delivered here by soprano Ying Fang. Principal Flute Stefán Ragnar Höskuldsson is the soloist in a newly commissioned concerto written for him by the esteemed Lowell Liebermann.