Music Theory Tutorial was originally designed as an online remedial program to be used by incoming transfer students to the University of California, Santa Barbara Music Department. In its current state, the textbook consists of twenty-eight modular chapters with exercises and end-of-chapter tests. The book begins with rudimentary lessons on material typically covered at the beginning of an undergraduate music major's first semester of theory (notation, rhythm, meter, scales, etc.) and concludes with concepts commonly found in third-semester courses (chromatic harmony, harmonic function, etc.). Despite its intended purpose, the breadth of content covered therein makes this book suitable for use as the primary textbook for first-, second-, and third-semester music theory courses in a wide range of music departments, schools, and conservatories. It could also be used in introductory classes for non-majors or by individuals outside of traditional music programs for self-paced study.