The importance of the influence of Italy on the earlier forms of composition was not less important than that which she wielded in other branches. The sonata, as its name indicates, is of Italian origin. For a long time the composition of sonatas was cultivated almost exclusively by the violinists. Corelli and Tartini are its principal inventors and representatives. Although they looked upon it mainly as an opportunity to display their technical accomplishments, nevertheless, the musical ability of these two violinists was so great that they constantly sought a noble classical form for their thoughts, and gave to the composition a harmonic construction which corresponds to the most advanced ideas of the time. As has already been said, the chief remarkable phenomenon in the development of the sonata among the masters of the violin, was the rapidity with which a firm structure in respect to harmony and the relation of keys was produced. The delicate instinct of Corelli and of some of those who followed him, divined and grasped the effect and importance of the effects of certain keys in connection with others distantly or closely related, and the extended and consistent working out of this principle produced those very works which have made their composers renowned far and wide. The Italian violinist cultivated principally the "intermediate type" which joins the earlier and later sonata style, and in which the first or principal theme appears at the beginning of the first half and reappears near the end, quite in accordance with the custom of our own day. As a noteworthy example of this style, the tempo di gavotta of the eighth sonata, in Corelli's opera seconda, may be named. Among other good examples are the last movement in Tartini's fourth sonata (Op. 1) and the last movement of that in D minor; also the last movement of Geminiani's sonata in C minor, some parts of Vivaldi's sonata in A major, and some sections also of Nardini's sonatas. Pietro Locatelli (born in 1693 at Bergamo, died in 1764 at Amsterdam) became, at the most tender age, a pupil of Corelli, at Rome. He travelled and settled finally in Amsterdam. He was a very original virtuoso, and the first who introduced extremely difficult violin passages into his compositions. He is therefore generally called the forerunner of Paganini. Francesco Geminiani (born in 1680 at Lucca, died in 1761 at Dublin), a pupil of Corelli at Rome, also studied composition there with no less a master than Scarlatti. He possessed an extraordinarily lively temperament, which, according to the testimony of contemporary writers, showed itself strongly in his performances. In 1714 he went to England, where he became very popular, and was received into the house of Lord Essex, who became his pupil.