Medtner's 14 piano sonatas, the most significant achievement in this genre by any major composer since Beethoven, span his career. The Sonata-Ballade explores a tempestuous musical allegory – the triumph of Light over Darkness, of Faith over Doubt; while the Sonata in A minor is cast in a single, terse movement, with folkloric elements and frequent use of bell-like features that exude Russianness. By contrast, the ‘Night Wind’ Sonata is a monumental epic of exceptional complexity that stunned Rachmaninov and led composer and critic Sorabji to call it ‘the greatest piano sonata of modern times.’