Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent Scale Book

This is a great book at a great value. For only $6, almost anyone can buy this book. Don't be mislead however, in this little book there is a wealth of information about scales. This book practically taught me to improvise. It may be small but it will take many months and almost guarantee years for the beginners to master the material. Also works great at building left and right hand technique if you have been playing guitar for a while.