Music theory is vital to every musician. A proficient guitarist will generally be proficient in music theory as well.
Music theory provides the building blocks, the equations, and the basic “science” necessary to understand how and why music works. Why do certain chords sound “good” together? Why do some chords clash? How should music be arranged? The list of questions goes on. Alfred’s Essentials of Music Theory helps to answer many of these questions by laying down the basic building blocks necessary to understand music.
The book is well arranged, covers the basics, and is generally quite easy to understand. I have seen it used successfully from Jr. High students to adults. It serves as a workbook and a textbook of sorts. It also has ear training exercises designed to train the student to recognize intervals, timing, and other important elements crucial to the training of the ear. This is an eminently usable music theory book for the student of any instrument or no instrument at all! Guitar students will benefit from the clear explanations given and it will provide them with a foundation for understanding music theory for the guitar as well as other instruments.
This book is highly recommended for the music student.