In his recording of Bach's 48 Colin Tilney, unlike his fellow competitors in the same repertory, plays both a clavichord (Book 1) and a harpsichord (Book 2). Why not? Bach's title for the first book of 24 preludes and fugues, The Well-tempered Clavier leaves both this issue and that of tuning wide open. The clavichord was a favourite instrument of Bach's, so was the harpsichord and the organ; indeed, I am sorry that Tilney does not include a chamber organ since some of the pieces, the E major Prelude and Fugue (Book 2), for instance, seem well-suited to it. Tilney's performance of the 48 differs again from almost if not all others in the sequence which he adopts in playing the preludes and fugues. But an apparently random approach is in fact nothing of the kind, but one that is directly linked with tuning. We know that Bach himself was a master in matters of tuning as he was in all other aspects of his craft. What we do not know is the exact nature of his tuning.
“These are performances in which tempos, phrasing, articulation and the execution of ornaments are convincing,” wrote Gramophone of Jarrett’s first recorded account of The Well-Tempered Clavier. “Both instrument and performer serve as unobtrusive media through which the music emerges without enhancement.” In this live recording from Troy, New York, made in March 1987, just one month after his studio recording of the work, Keith Jarrett addresses the challenges of Bach’s great set of preludes and fugues once more. Part of the goal is transparency, to bring the listener closer to the composer. As Jarrett explained at the time: “The very direction of the lines, the moving lines of notes, are inherently expressive…When I play Bach, I hear almost the process of thought. Any colouration has nothing to do with this process.“