Schubert played the viola in the family quartet but wrote music for violin which spans his short life, three dating from 1816 when he was still in his teens. Intimate in nature, these owe much to Mozart in mood and style. Barely a year later – when he wrote the more ambitious fourth, in A major – Schubert had found his own voice, full of pathos, flickering between keys, at once joyful and tender with the skittering piano figurations we recognise from the song cycles. Most bewitching of all, and performed with a lightness and poise by this established duo, is the Fantasy in C major, breaking convention at every turn, written in 1827. A year later he was dead.