In his twilight years, Bartók composed his Piano Concerto No. 3 as a kind of love letter to his wife. Hélène Grimaud and Yannick Nézet-Séguin immerse us in the composer’s deep and loving intimacy. The Orchestre Métropolitain then performs Mahler’s Symphony No. 5, a work that, while reflecting the torments of an artist facing illness, remains a remarkable ode to life.