Considering then that Alberti was held in such high esteem as late as 1772, and that D. Scarlatti complained of him that he wrote in a manner less fitting to the harpsichord than to some other instrument, it seems likely that to him in part is due the appearance of the singing allegro in harpsichord music, which was to be characteristic of Christian Bach, of Mozart, of Haydn, of Clementi and in some part of Beethoven. The sonatas themselves bear this out. The eight which we have been able to study, are light stuff, indisputably. But the triplex form is clear in most of the movements. He uses two separate distinct melodies as themes. The first appears at once in the tonic, the second later in the dominant. The first section, which is nothing more than the exposition of these two themes, is repeated. After the double bar follows a section of varying length, usually dominated by reminiscences of the first theme, the modulations of which are free but by no means unusual. Then the third section repeats both melodies in the tonic key. The first movement of a sonata in G major is conspicuous for the length of its second section, in which there is not only a good bit of interesting modulation, but also actually new material. The bass which bears his name is no more than the familiar breaking of a chord in the following manner: [Illustration: Music score] It is hardly more true that he invented it than that such a formula is intrinsically as contemptible as many musicians, mostly theoreticians, would make it out to be. If a musician is, in a given composition, concerned with melody, he may be justified in following the procedure which makes that melody reign undisputed over his music. This inevitably will reduce the accompaniment to the simplest function possible; namely, outlining or supplying the harmony upon which all melodies, since the Middle Ages at least, have been felt to rest. In the first sophisticated experiments with melody--the opera early in the seventeenth century--the accompaniment to a song was frequently no more than a few occasional chords upon the harpsichord. These chords were not even written out for the accompanist, but were indicated to him by figures placed over the notes of a single bass part. As composers acquired skill in combining several instruments in accompaniments to their operas, the figured bass lost its importance; but it was still employed as a sort of harmonic groundwork almost to the end of the eighteenth century. It was a prop to the harmonies woven more or less contrapuntally by other instruments, which, unlike the harpsichord, had power to sustain tone. [Illustration] Harpsichord composers. From top left to bottom right: D. Scarlatti, Couperin, C. P. E. Bach, Clementi.