About Sonatas K. 1 - K. 30

Among Scarlatti's sonatas for keyboard, K. 1 to 30, numbered according to their generally estimated composition dates by Kirkpatrick numbers, were published as Essercizi per Gravicembalo and dedicated to King João V of Portugal in return for the bestowal of a knighthood. (This collection is generally translated as Exercises for Harpsichord, and while Scarlatti's works for keyboard instruments are primarily presumed to be for harpsichord, the current state of research does not definitively rule out other keyboard instruments.) This was the only collection published by the composer himself during his lifetime, and its preface holds value as an authentic documentary source by the composer himself.

The preface suggests that the collection aims at the cultivation of performance technique, leading to the inference that it was written for the practical purpose of daily practice for Maria Barbara, whom he served as a music teacher. Regarding the composition dates, many researchers argue for an early composition period, positing that the Essercizi are revisions of sonatas written considerably earlier, but no definitive conclusion has yet been reached.

The arrangement of all 30 pieces allows for progressive learning, with later works generally becoming longer and more difficult. The form is fundamentally binary. Furthermore, it is typical of Scarlatti's sonatas for the opening of a piece to feature a brief imitation between the hands; in many cases, the imitative figure appears to have little obvious relation to the main material of the rest of the piece.

The preface also contains remarks touching upon the overall musical content of the collection, but their interpretation has been repeatedly debated, partly due to the nature of the preface as a text prone to expressions of humility or conventional formality.

K. 15 Allegro

A uniform rhythm of sixteenth notes is dominant, and for most of the duration of this rhythm, the hands cross. In both the first and second halves, the hands return to their normal positions only at the beginning and when entering the repetitions of the final cadences that close each half.