XVI. Middling composers, although, by endeavouring to tread in the steps of the excellent ones, they do not fall into such gross errors, generally form a music, which at some times is lifeless, and at others turgid. This is occasioned by their introducing accidentals, and changing the keys in the same piece; which method, if practised by great masters, who used it seasonably and opportunely, not only gives a greater sweetness to the music, but communicates to the words, a more striking impression, than they of themselves, without this assistance, could convey or produce. Some strangers had a happy talent at doing this; but no one understood it better, than our Don Antonio de Literes, a composer of the first rate, and who is perhaps the only one, who knows how to unite all the majesty and sweetness of the antient music, with the bustle and hurry of the modern; but in the management of the accidental points, he has a singular address, for almost every time he introduces them, they give an energy to the music, which is correspondent to, and strengthens the signification of the words they fall on. To do this, requires both genius and science, but much more genius than science. From this deficiency in point of genius, we find masters in Spain, of great knowledge and comprehension, who were not so happy as to succeed in this way; so that, although in their compositions we admire the subtilty of their art, their works do not obtain the approbation of our ears. XVII. Those who are unassisted by genius, and who, on the other hand, do not possess more than a moderate knowledge of music, make false concordances, introduce accidentals, and change the keys, because doing so is the fashion; and because they are fond of having it thought, they know how to manufacture these sort of airs; although, in reality, they seldom produce any air at all; and notwithstanding their compositions are conformable to the common rules, still they are unsavoury, and disagreeable; and when they are performed in the church, instead of producing that sweet calm, and inward composure which are requisite to devotion, they excite perturbations in the hearts of the hearers.