Michael Tilson Thomas lends his fresh insights to a compelling Austro-Germanic program. It includes Mozart’s whirling Six German Dances as well as his expressive and intimate Piano Concerto No. 23, which features Orion Weiss, acclaimed for his “limpid touch, clean runs and purling legato phrasing” (Chicago Tribune). Schoenberg’s lavishly imaginative orchestration of Brahms’ Piano Quartet No. 1 completes the program.