Beethoven’s Third Piano Concerto is a landmark of his dark and restless middle period, here featuring Seong-Jin Cho, whose 2018 Chicago debut offered “about as thrilling a display of sheer powerhouse keyboard bravura as one is ever likely to encounter” (Chicago Classical Review). Gemma New conducts the program, which closes with Mendelssohn’s Scottish Symphony, evoking highland mists, warring clans and long-lost folk dances.