Finnish harpsichordist Aapo Häkkinen plays Book I of Bach's Well-Tempered Clavier on the Christian Vater harpsichord preserved in Nuremberg and on an equally historic clavichord. Two of the 24 pairs of Preludes and Fugues are even presented in an alternative instrumentation on the historic North German organ of Backemoor. Aapo Häkkinen, not least through his acclaimed AEOLUS recordings of Bach's harpsichord concertos, continues to reveal the richness and expressive possibilities of these masterpieces.