The book fosters the ability to read a melody, grasp the basics of harmony, e. g. add chords to a melody. It is envisaged that the study will lead to more confidence and competence in participation in music activities.
Music is an important element in many people’s lives, even if they have not studied the subject formally. To these I would say, a good basic knowledge of music notation will enhance your interest and enjoyment in making and listening to music.
There is a rhythm in life. Let’s row along with this.