Prodigious pianist Hélène Grimaud, whose “performances attempt, whenever possible, to shake up conventional pianistic wisdom” (The New Yorker), climbs four summits of the piano literature. Beethoven’s Sonata Op. 109, a work of volatility and ravishing poetry, paves the way for Brahms’ heart-warming Fantasies and his wistfully nostalgic Three Intermezzos, as well as Busoni’s colossal arrangement of Bach’s solo-violin Chaconne.