It is, then, the music lover unfamiliar with all musical technique, and quite unspecialized in his interest, who most needs the help that these preliminary suggestions may offer. The kind of help he will want will depend, of course, on what it is he chiefly wishes to gain by his reading. Now we shall probably not go far wrong in saying that such a reader will desire, first, that general knowledge of the most important schools and the greatest individuals of music history which is not only a powerful aid to the enjoyment of music, but is nowadays coming to be considered an essential part of a liberal education. Secondly, he will wish to gain sufficient familiarity with music itself, and sufficient understanding of the instruments by which it is produced and the ways in which they influence its structure and style, to afford him the basis for sound discrimination between good, bad, and indifferent music, to develop, in short, his taste. In the third place, he will justly consider that, however abstruse and involved the theory of music may be, its fundamental principles are nevertheless accessible to the layman, and that familiarity with such principles, especially those of musical structure, affording as it will an insight into the way music is put together, is an invaluable aid to that sympathetic understanding of it which comes only to the alert and attentive listener. In a word, the music lover will demand of his reading that it instruct him historically, that it refine his taste by developing his sense of style, and that it intensify his enjoyment by showing him how to listen. Glancing now at the table of contents, we shall see that 'The Art of Music’ naturally divides itself into three portions, each especially suited to subserve one of these three needs of the reader. The first four volumes, historical in character, are primarily instructive. Volumes V to IX, inclusive, deal with the practical side of the art--what is sometimes called 'applied music’--and in describing the chief media by which it is produced, such as the voice, the organ, the piano, the string quartet, the orchestra, provide general notions of what is appropriate to each. The short essays on harmony and on form in Volume XII, and many passages of explanation of similar matters scattered through all the volumes, will acquaint the student with the fundamental principles of musical theory and the standard types of musical structure, thus affording him valuable aid to appreciative listening. The three portions of the work, historical, practical, and theoretical, are finally correlated and unified by Volumes XI and XII, the Dictionary and Index, and illustrated by the musical examples in Volumes XIII and XIV.