Having in view the great quantity of his compositions, Boccherini must be distinguished as an extremely prolific composer. There are in existence 400 instrumental works by him. They consist of 20 symphonies, 125 string quintets--amongst them are 113 for two cellos, of which the first cello is more or less an obbligato--91 string quartets, and numberless trios, septets, quintets with flute or oboe, violin sonatas, as well as several vocal compositions for the church, &c. Very little has proved capable of surviving, and this little only awakens a limited interest. The cause of it seems to be in a certain simplicity which underlies all Boccherini’s music. With great cleverness of form, added to an apt and easy flow, it is certainly not wanting in originality, which has even a humorous tendency; but the manner of expression is characterised by a certain formality which gives to Boccherini’s music an antiquated air. His ideas are wanting in power of thought and depth of feeling; they rarely rise above the pleasing and agreeable. At the beginning of the century the chamber compositions of Boccherini had an extraordinary popularity, especially amongst the _dilettanti_. From that time, however, they have been little played, at least in Germany. The interest in them was maintained much longer in France, where they were unusually prized, according to Fétis’s “Biographie Universelle des Musiciens.” There also they have been for some time laid on one side. Boccherini composed six concerti specially for the violoncello. There are also extant several cello sonatas with bass by him. It is surprising that there is no mention made of them in the list of Boccherini compositions by Fétis. Six of these sonatas have been republished on the one hand by Friedrich Grützmacher, and, on the other, by Alfred Piatti, with piano accompaniment. The violoncello concerti of Boccherini, on the contrary, have fallen almost entirely into oblivion. They are only so far interesting in that by them is shown to what degree of technique cello playing was developed by this master. We must here observe that he was one of the first of the Italian school who gave decided expression to the solo and virtuoso side of his instrument. He not only made possible for cello music the higher and highest parts of the thumb position, with the exception of the complicated harmonics first discovered and made available after his time, but he also considerably extended beyond his predecessors the playing of double stops as well as the execution of passages.[71]