It was during the eighteenth century that the pianoforte definitely established itself in the estimation of musicians, artists and the common people, as the handiest and most useful of domestic and solo instruments. The progress was very slow at first, the musicians such as Bach, Haendel, Scarlatti and Rameau, the four great virtuosi of the beginning of this century, generally preferred the older forms of the instrument, the clavier or the harpsichord, both on account of their more agreeable touch and the sweetness of their tones. Nevertheless the style of playing and of writing for these instruments underwent a gradual change at the hands of these very masters, of such a character that when the pianoforte became generally recognized as superior to its predecessors, about the middle of the century, the compositions of Bach and Scarlatti were found well adapted to the newer and more powerful instrument. The pianoforte itself underwent several modifications from the primitive forms of action devised by Cristofori in 1711, rendering it more responsive to the touch. All this, relating to the mechanical perfection of the instrument, although appropriate in part to the present moment of the narrative, is deferred until a later chapter, when the entire history of this instrument will be considered in detail. From that it will be seen, by comparing dates, that every important mechanical step in advance was followed by immediate modifications of the style of writing and playing, whereby the progress toward fullness and manifold suggestiveness of music for this instrument has been steady and great. The first of the great virtuosi was Domenico Scarlatti (1683-1757), son of the great Alessandro Scarlatti, and a pupil of his father, and of other masters whose names are now uncertain. He was a moderately successful composer of operas and works for the Church, but his distinguishing merit was that of a virtuoso upon the harpsichord--the pianoforte of that time. He was the first of the writers upon the harpsichord who introduced difficulties for the pleasure of overcoming them, and who, in his own country, was without peer as performer until Haendel came there and surpassed him, in 1708. Scarlatti was also a performer upon the organ, but upon this instrument he unhesitatingly confessed Haendel to be his superior. In 1715 Scarlatti succeeded Baj as chapel master at St. Peter's in Rome, where he composed much church music. His operas were successful in their own day, but were soon forgotten. His pianoforte compositions still remain as a necessary part of the education of the modern virtuoso. They are free in form, brilliant in execution, and melodious after the Italian manner. Many of them are still excessively difficult to play, in spite of the progress in technique which has been made since.