Subject matter is fine, however the book is printed on very low quality, thin paper (similar to eco-friendly toilet paper) that literally decomposes with use. When one erases pencil marks, the paper "pills" and then one ends up with a hole in the page! The binding is low quality glue, and so pages fall out of the book in no time. It is entirely inappropriate choice of paper stock and binding method for a WORKBOOK (which is what it is). Would be OK for a 1-time quick read mystery. The $70 price tag seemed VERY HIGH before the book arrived, but now, OUTRAGEOUS. I am very disappointed with the music teacher who required students to purchase this book for the course -- (presumably she knew beforehand what this book was like). There are MANY other books that cover this subject equally well, but are far better made for the gentle wear and tear a workbook should be able to sustain. And they cost much much less!