In 1975, an idiosyncratic musical odyssey called The Köln Concert became the unlikeliest of multimillion-sellers. On that album, Keith Jarrett revealed how an unplanned, unplugged and uncommercial private meditation between just him and a traditional piano could mesmerise listeners all over the world. Jarrett has also played plenty of classical music and ensemble jazz with stars including Miles Davis and Charles Lloyd. But he has fearlessly cherished the no-hiding-place art of solo-piano improvisation, as witnessed by live albums including 2006’s Carnegie Hall Concert, 2011’s Rio and, of course, that 1975 opus. In 2018, two successive strokes ruthlessly halted that spontaneous alchemy, which makes this final Jarrett solo performance, recorded in July 2016, something special.