What can I write about Stephen Hough’s startling, stunning concert at the Festival Hall last night?

During the second half, between the miniatures by Debussy and Beethoven’s elemental Appassionata Sonata (Op 57), I leaned across to my concert companion and muttered that this concert seemed to be all about spontaneity and improvisation, the short works by Debussy which opened both halves of the concert, in themselves, and in Hough’s skillful hands, improvisatory in character, revealing the same qualities in the works by Schumann and Beethoven. One had the sense of meticulous preparation – and Stephen has talked before in interviews and articles about practising of the need to be “a perfectionist in the practise room” so that one can be “a bohemian” on stage – which enabled him to step back from the music and set it free.

It was an unusual programme. Other pianists may not have been able to pull it off so convincingly, and certainly opening with Debussy’s much-loved Claire de Lune from the Suite Bergamasque was potentially risky. The piece is so well-known, so prone to clichéd readings – yet Hough’s sensitive, unfussy shaping of this work saved it from saccharine sentimentality, and the delicacy of his sound and touch encouraged concentrated listening while also creating a wonderful sense of intimacy in the vastness of the RFH. It was as if we were in Debussy’s drawing room, gathered around his upright piano. And as Stephen said in the pre-concert talk, in the moments of the concert, we can “all be friends”, forgetting our differences of opinion or politics, joined in the shared pleasure of music.

In the programme notes, Stephen Hough explained that his choice of repertoire highlighted the very different approaches the three composers took to writing for the piano. While Debussy’s works (Clair de Lune, the two books of Images and the Prelude La terrasse des audiences du clair de lune) are “sensual paintings with mystical suggestions” [SH] (and even without the titles, their distinctive soundworld immediately conjures up potent, perfumed images in the listener’s mind), the two works by German composers are abstract and tightly structured with clear musical architecture.

And so while Debussy was light (feathery, but never fluffy) and delicately hued, the textures of Schumann’s Fantasie in C seemed all the richer in comparison, the composer’s passion for Clara all there in every note and phrase (Schumann often wears his heart on his sleeve), balanced by lyricism and tenderness, particularly in the glorious closing movement which seemed to evolve and expand there and then.

Similarly, the Beethoven felt wrought before our very eyes and ears, the opening measures creeping out of the mysterious darkness of the lower registers into something resembling light, if only briefly, the work fantasy-like in its range of ideas and striking contrasts. The outer movements were fraught with emotion, urgent and agitated, the middle movement providing a calm respite before the finale was unleashed upon us with, its feverish intensity all the more terrifying for the restrained tempo: this was music on the edge of chaos.

Stephen returned to Schumann for the first encore, one of the Symphonic Etudes which was rejected by the composer – a brief few moments of meltingly beautiful filigree traceries. And a Chopin nocturne to close this exceptional evening.