Number System for the Minor/ Major Pentatonic Scales. The method that will be presented will give you a clear understanding of the fretboard. The concepts presented in this book, will enable beginner or intermediate guitarist. That has been struggling with scales, and confusing on how to be able to change keys, without learning a new Key. This method will give you a better insight into what an Intervals is, how to construct Arpeggio's, and a clear concept of the Modes of the Major Scale.