MY Evolution of Harmony was intended for students of some maturity, and for those who are able to devote 'a considerable time to the subject. A large number of those who have used it have expressed a wish that I should write a short elementary treatise on similar lines. The present book is the first part of this work. It is intended for beginners, for use in schools, and for. Students in musical institutions who have to acquire in a short time a knowledge of the main facts of harmony. In attempting to make the book short and concise, I have been compelled to make it somewhat dogmatic. As the book is for beginners, this is probably an advantage. No attempt is made to deal with modern technique. Obviously such a course would be quite out of place in a book of this nature. In the preparation of this volume I have kept in the foreground what I think are the essentials for any profitable study: (a) ear-training, (b) constructive work, (6) constant use of the unessential. If the study of harmony is to be of any use at all, it must enable the student to use the material about which he reads, even if it be in the most elementary fashion.