admits of universal communication, appears to rest on this, that every expression of speech has in its context a tone appropriate to the sense. This tone indicates more or less an affection of the speaker, and produces it also in the hearer; which affection excites in its turn in the hearer the Idea that is expressed in speech by the tone in question. Thus as modulation is as it were a universal language of sensations intelligible to every man, the art of tone employs it by itself alone in its full force, viz. as a language of the affections, and thus communicates universally according to the laws of association the aesthetical Ideas naturally combined therewith.

Now these aesthetical Ideas are not concepts or determinate thoughts. Hence the form of the composition of these sensations (harmony and melody) only