Mahler’s Fourth Symphony begins like Mozart and ends with a child’s idea of heaven. You can’t have missed the buzz around the CBSO and Mirga Grazinyte-Tyla, and Mahler’s gentlest symphony will make the perfect showcase for her artistry: the climax of a concert that also features harpist Xavier de Maistre and flautist Marie-Christine Zupancic in Mozart’s exquisite ‘Flute & Harp Concerto’.