Amazon.com description: Product Description: Classic Chicago Blues Harp #2 follows #1 and is a progressive lesson book that walks you step-by-step from the intermediate stages of playing the harmonica to the very advanced. This lesson book is the main backbone to the Harmonica Masterclass Lesson Series. Classic Chicago Blues Harp takes the major techniques used by professional artists and teaches it to you. Each chapter finishes in a chapter review test to help you in understanding the main points covered in each chapter. The D major diatonic harmonica is primarily used in this book, the other keys are A and C. This book comes with an online audio recording.