This text investigates the core question of how students can effectively master the complex harmonic shifts occurring between the late nineteenth and early twentieth centuries through self-directed study. Dr. Paul O. Harder, an established educator in the field of music theory, utilizes a structured programmed instruction framework to guide learners through the transition from traditional tonality to modern harmonic practices. By breaking down dense theoretical concepts into manageable, sequential steps, the book allows for immediate reinforcement of knowledge, ensuring that foundational errors are corrected before they impede further progress.

The subject matter points to a highly specialized, pedagogical resource designed for students and instructors seeking a rigorous, self-contained approach to music theory. Its reliance on programmed instruction suggests a focus on technical proficiency and systematic mastery of historical harmonic evolution.