The purpose of this book is to increase ability to play, improvise, compose melodies. Studying this book will increase your technique and give you new ideas for melodies. This book has 6 triad arpeggio patterns in all 12 keys. Each pattern plays up and down all the diatonic triads in each inversion from four different scales. There are a total of 864 drills. The 4 scales are: major scale, melodic minor scale, harmonic minor scale, harmonic major scale