Klavierbüchlein für Wilhelm Friedemann Bach (Bach's original spelling: Clavier-Büchlein vor Wilhelm Friedemann Bach) is a collection of keyboard music compiled by Johann Sebastian Bach for his eldest son Wilhelm Friedemann with a clear didactic purpose. Most of the pieces included are better known as parts of The Well-Tempered Clavier and the Inventions and Sinfonias. The pieces of the collection are arranged by complexity, beginning with the most simple works. The works are for “Keyboard” so may be played on any instrument: organ, harpsichord, spinet or clavichord. Bach however considered the clavichord as the best instrument for personal use, because it is able to express most adequate the finest thoughts and a cantabile way of playing. Played on the clavichord by Yuan Sheng, “China’s premier interpreter of Bach” (International Piano Magazine). A pupil of Solomon Mikowsky (Manhattan School of Music) and notably Rosalyn Tureck Yuan Sheng extensively studied the performance practice of Baroque music. Equally at home at the piano as the harpsichord he has an instinctive feeling for the possibilities, sonorities and touch of the instrument at hand, so that “the listener might easily have imagined the composer at the keyboard” (Boston Intelligencer). Yuan Sheng’s Bach performances reached over 6 million views on Youtube.