Demo Track 1&2 - Bach
Any piece described as "for the profit and use of musical youth desirous of learning, and especially for the pastime of those already skilled in this study" by the composer is going to be interesting at the very least. And then it turns out that J.S. Bach, the Maestro, the Undisputed First King of the Keyboard himself wrote that, and that's enough said, really. The Well-Tempered Clavier. Every pianist has played a few. They're standard repertoire basically at any time; I pers