The Six Partitas, BWV 825–830 were the first of a series of works for keyboard instruments that Bach published under the general title of Clavierübung (Keyboard Practice). They consist of a set of six harpsichord suites, are amongst the last set of keyboard suites Bach composed and the most technically demanding. In fact, although Bach was age 40 at the time, these were the first of his compositions to see publication. The Partitas follow the basic form of the Baroque dance suite. An elaborate opening movement is followed by four stylized dances: the Allemande, Courante, Sarabande, and Gigue.