This is the basic textbook of music theory for the British system organized by the Associated Board of the Royal Schools of Music in London. All British and thousands of students overseas follow this standard curriculum on the basics of written classical music. It is a well-organized introduction to the basic elements of standard diatonic harmony and musical structure. It accompanies an eight-part syllabus of amplified instruction, musical examples, and thorough instructions on how to pass the ABRSM standardized tests given for each level. It is most valuable used in conjunction with the course, since it is densely written and in a compact format, so the other course materials are necessary to make the most of it. It is invaluable preparation for the standardized ABRSM music tests, but has limited usefulness as a standalone text.