Whom he had to thank for instruction is not known. There is nothing in his music to suggest that he was ever a pupil of Bernardo Pasquini, who, however, was long held to have been his master. J. S. Shedlock, in his ‘History of the Pianoforte Sonata,’ suggests that he learned from Gaëtano Greco or Grieco, a man a few years his senior and a student under his father; but it would seem far more likely that Domenico profited immediately from his father, who, we may see from a letter to Ferdinand de’ Medici, dated May 30, 1705, had watched over his son’s development with great care. It must not be forgotten that Alessandro Scarlatti’s harpsichord toccatas, described in the previous chapter, are, in spite of a general heaviness, often enlivened by astonishing devices of virtuosity. Scarlatti wrote between three and four hundred pieces for the harpsichord. The Abbé Santini[12] possessed three hundred and forty-nine. Scarlatti himself published in his lifetime only one set of thirty pieces. These he called exercises (_esercizii_) for the harpsichord. The title is significant. Before 1733 two volumes, _Pièces pour le clavecin_, were published in Paris; and some time between 1730 and 1737 forty-two ‘Suites of Lessons’ were published in London under the supervision of Roseingrave. More were printed in London in 1752. Then came Czerny’s edition, which includes two hundred pieces; and throughout the nineteenth century various selections and arrangements have appeared from time to time, von Bülow having arranged several pieces in the order of suites, Tausig having elaborated several in accordance with the modern pianoforte. A complete and authoritative edition has at last been prepared by Sig. Alessandro Longo and has been printed in Italy by Ricordi and Company.