Anniversary …

… Happy Birthday, Well-Tempered Clavier - JSTOR Daily. (Hat tip, Dave Lull.)

… There’s now consensus that when Bach wrote “Das Wohltemperirte Clavier,” he meant “clavier” to signify any musical keyboard—harpsichord, clavichord, organ. He did not mean the modern piano as we know it, the very instrument upon which The Well-Tempered Clavier is played most often now, because modern pianos had yet to evolve.