Scarlatti was far more richly endowed than these composers, both by nature and by art. In the Newberry Library, Chicago, there is one opera of Scarlatti's complete, "La Rosaura" (Edition of the German Society for Musical Research), which was probably produced between 1689 and 1692. As compared with the operas by Monteverde, the melody of this work is much more free. There is a _largo_ prelude and aria of Climene in the second scene, with a string introduction, beautifully done. The violin part is very noble and effective. The second part of the aria is in A minor and other keys, ending in C minor, after which there is a _da capo_, bringing back the main aria. I know not whether this _da capo_ was written by Scarlatti, or was an addition by the later editor; but inasmuch as the date of this opera so closely coincides with that of "Teodora" (1693), generally regarded as the first example of the _da capo_, this may well enough be an earlier case, unknown to the former writers. In the fifth scene there are some running divisions which are extended to considerable length, the word "spasso," for instance, having seven beats of common time, sixteenths. Throughout this work minor tonality preponderates very much, all the airs being in minor, and only one or two of the _ritournelli_ being in major. Rosaura has a good air in the second act, and there is a remarkably fine piece of work for violin solo, lute, and 'cello, the cembale being silent. M. Fétis says that in "Il Cadute de' Decemviri," played in 1705, "All the airs have a sentiment corresponding with the words, and a taking originality. Many have a solo violin with two other violin parts. In the second act an air of touching expression is accompanied by violin solo, with obbligati 'celli, and bass alone. The piece is full of strange harmonies and bold modulations, and is of exquisite beauty." It was Scarlatti's good fortune to be active as a composer at the very time when the violin had received its finishing touches at the hands of the later Amati and Antonio Stradivarius. The first great violin virtuoso, Archangelo Corelli, had published his epoch-marking works during the last quarter of the seventeenth century. Scarlatti appears to have entered into the new musical world thus opened with ever fresh enjoyment and a rare intelligence. Fétis says that in "Laodicea e Berenice" (1701) he wrote an air with obbligato for violin and 'cello, the former having been intended for Corelli; but upon its proving impossible to secure Corelli, the air had to be given up because there was no violinist sufficiently skilled to play it. In "Tigrane" (1715) the orchestra consisted of violins, violas, 'celli, basses, two horns, two oboes, which was an unprecedented number at that time. In "La Caduta de Decemviri" (1706) the air _Ma, il ben mio che fa_ was accompanied by violins in four parts, with admirable effect. Obbligato solos are also frequent.