Hearing Johann Sebastian Bach’s (1685-1750) preludes and fugues from The Well-Tempered Clavier played in the same music room on three historic organs built in the same decade of the 18th century by three great representatives of the German organ-building tradition is a unique opportunity. The Swiss organ by Joseph Anton Moser (Fribourg, c.1767), the German organ by Jacob Engelbert Teschemacher (Elberfeld, c.1770) and the Dutch organ by Johannes Mitterreither (Rotterdam or Gouda, c.1760). Through the subtle interplay of their tonal colours, they invite us to experience the theory of affects, so dear to the Baroque era, revealing the profoundly poetic and human dimension of the Well-Tempered Clavier in the chromatic progression of the 24 keys.