The earth and sky embrace when Dane Lam leads Gustav Mahler’s celestial Symphony No. 4 with operatic soprano Sofia Troncoso’s fiendish agility. Paired with Barber’s captive Knoxville: Summer of 1915 and the Pacific Premiere of Huang Ruo’s climate-change inspired Tipping Point (HSO Co-Commission), wander through the crisp and breathtaking colors of the changing world.