Vieuxtemps is considered today as the most famous representative of the Franco-Belgian violin school. Robert Schumann himself spoke in 1834 after a concert of the child prodigy, then aged 14: "With Henri, we can close our eyes with confidence. As a flower embalms, so shines his game. "Vieuxtemps was also a great viola player and wrote, apart from his many pieces for violin, some compositions for this instrument. Composed in 1862, the Sonata op. 36, which passes from an expressive Maestoso to an elegiac barcarolle and scherzando passages, appears among the pearls of the literature for viola. It is published here for the first time in an Urtext edition.