Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Incredible tool

This book works. I am an intermediate level pianist. My skills have quickly developed with the use of this book. The first thing I did was take it to be spiral bound. This really helps. I am presently on Chapter 5, and I have found that the progression through the material has been very natural. I recently purchased the MIDI files through Mark Harrison. These are also helpful. I recommend this book without reservation, however I would not recommend it for beginners.