On 24 January 1975, pianist Keith Jarrett gave an entirely improvised concert at the Cologne Opera House, a performance that has since become an iconic jazz record. Fifty years on, Melaine Dalibert pays tribute to the A-side of this anthological moment, turning this spontaneous burst of sound into a genuine repertoire piece. His exploration of the great piano classics, including the Köln Concert, is part of an artistic journey that combines virtuosity, minimalism, and a love of play.