Johann Sebastian Bach's Clavier-Übung II elevates two differing national styles to create a pair of incomparable masterpieces. The Italian Concerto uses the spectacular effects available from a two-manual harpsichord to represent contrasts between different groups of instruments, while the French Overture, Bach's longest keyboard suite, explores French harmonies, rhythms, ornamentation and melodic invention in the dark and dramatic key of B minor. Both the multiple counterpoint of the Fantasia and Fugue in A minor and the unusual harmonic richness of the Sonata in D minor further represent Bach's mastery of the keyboard and genius as a composer.