Scarlatti's sonatas were originally entitled 'Essercizi' ('Exercises'), and their purpose was to provide musical études for the development of keyboard technique, primarily for his patroness, Queen Maria Barbara of Spain, who must have been a talented harpsichordist. In one of his published collections, he indicated that the Essercizi offer 'no profound Learning, but rather an ingenious Jesting with Art, to accomodate you to the Mastery of the Harpsichord.'