Two important works dominate volume nine of this series. The first is Bartók’s substantial and ambitious late-Romantic Piano Sonata, Op. 19, a very early work, composed when he was around 17 before his studies in Budapest. It was long considered lost and is heard in Goran Filipec’s performing edition, prepared from the manuscript. Zongoraiskola or ‘Piano Method’ was devised in collaboration with composer, pianist and teacher Sándor Reschofsky who contributed the exercises. Bartók’s 48 original pieces are perfectly formed and charmingly refined, allowing him an opportunity to explore his ideas of piano pedagogy.