Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Having lots of fun with this

This is a nice introduction to blues guitar. With a good combination of theory and practice, each lesson builds on the previous material. The one confusing thing I've found so far is the fact that the author will introduce some chord forms for a given lesson, then in the practice exercise, a completely unknown chord form will appear. It isn't that the "new" chord is wrong - it just hasn't been covered in the lesson. Guess that keeps you on your toes, tho. The CD has some really nice "studies" that you can play along with. Bottom line - after about 4 weeks, I've gotten through the first four lessons and I'm having more fun with my guitar than ever. Your mileage may vary.