This book was adequate in the description and explanation of music theory, however it is not my favourite . . in several areas there are details that are not very clear - the instruction seems to start off very basic (which is exactly how it should begin) but then ramps almost too quickly into sketchy but complex explanation . . it is a slim volume and brief, but a bit too brief for some of the more difficult to grasp concepts. For just about the same money you can get (from Amazon) Learn to Read Music by Howard Shanet which is much more thorough, still starts with the very bare bones basics, but then is more consistent with the explanations as the concepts become more and more difficult.