May I add one word on the musical criticism contained in my work? I am quite aware that it must stand on its own merits, and I am only anxious to express my full consciousness of the difficulty of my undertaking. That the substance of a musical work cannot be verbally represented, and that its effect on the hearer is incapable of being reproduced by description, least of all by a climax of high-sounding adjectives, admits of no dispute. Properly speaking, as Schumann once wished for the musical critic, when a {INTRODUCTION.} (xxiii) composition is discussed, there should be singers and instrumentalists ready at hand to perform it. But this being scarcely feasible, we are driven to a verbal attempt at reproducing the essence of the work. Such an attempt can only succeed by starting from artistic form, and showing how its laws and types, its technical conditions, its manifold application and development, are all represented in the most individual modifications. A general idea of the work, however, is all that can be arrived at by this means; the immediate impressions made upon the mind by its performance cannot be reproduced; neither can the attempt to express in words the artistic frame of mind which finds its expression in the forms of the work be altogether successful, and it is impossible to apprehend the degree in which the artistic mood imbues the artistic form otherwise than by observation of the work itself. Descriptions of musical works, therefore, since music cannot, like painting, borrow analogies from visible nature, must remain mere approximations of the original; they become more definite in proportion as they fall in with the reader's own experiences, and find in these analogies and, as it were, precedents for the new ideas it is sought to convey. The main difficulty consists in the fact that among a large circle of readers (which I know you wish for me) the degrees of musical cultivation to which appeal may be made are necessarily very varied. It would be impossible, on this account, to treat the subject in the purely technical manner which would be the shortest and most convenient were musicians only addressed; neither can every separate point be treated from its very beginning, without a presupposition of some knowledge and comprehension on the part of the reader. There only remains then, as it seems to me, such a consideration of musical form from varied points of view, and proceeding in varied directions, yet always with reference to some particular case, as shall bring into play the reader's special musical experiences and assist him to a true understanding of the subject. If he should be struck with only one particular point and should feel it become a reality for {LIFE OF MOZART.} (xxiv)