A complete tool for musicians. This book has evolved over the years in which we have written, taught and corrected the course we teach at the Musician Institute. This school is a music school that emphasizes the stage rather than the magis courses. This is why we study harmony and theory in a practical way rather than theoretical or intellectual. The purpose of this course is to allow everyone who plays an instrument to read and understand a score. The goal is to con enough the language not to have to stop too much on what to do: be able to use it as an instrument that can help you think more musically and therefore play better and more quickly. That's why the concepts in this book do not replace a good command of the instrument, or experience, a good ear or style but it provides you with a structure that unites all these elements, making you an accomplished musician.