This book is titled:

HOW TO UNDERSTAND MUSIC:
A CONCISE COURSE OF MUSICAL CULTURE
BY OBJECT LESSONS AND ESSAYS.

Written By W. S. B. MATHEWS.

See below for an excerpt from the preface -

As a text book, the present work covers a new ground, its prime object is to lead the student to a consciousness of music as MUSIC, and not merely as playing, singing, or theory. It begins at the foundation of the matter; namely, with the observation of musical phraseology the art of hearing and following coherent musical discourse. This occupies the first two parts, and covers a wide range of topics, as will be
seen by reference to the table of contents, or the chapters themselves.
From that point the studies take a different turn, and lead to the
perception of the inner something which gives music its life. That inner
life of music is IMAGINATION and FEELING, and almost the entire
remainder of the work is taken up with the study of music in relation
to these, its Content.