Position X and The Twelve Shape Theorem is an advanced yet practical guitar chord and scale shape reference for all guitarists to enjoy. In Position X, all the shapes are movable to, and at the same time fit in, any single position along the guitar fretboard. Position X introduces and showcases the twelve main root note shapes as they exist in the given guitar position using four chord types, the augmented, major, minor and diminished, as well as four scale types, the descending melodic minor, harmonic, ascending melodic minor and major. The very cool three on a string pentatonic scale shapes are thus featured beneath the related descending melodic minor form and all modes are considered to be part of the major scale when questioned. In this book, six is the exact number of consecutive frets involved in any guitar position and each one of those positions contains a musical span of two octaves plus a perfect fourth. Also, the 2nd & 3rd fingers on the fretting hand are to remain stationary in that six fret position. This is considered normal for the fretting hand and as such, the first and fourth fingers can stretch or slide just a fret in either direction. And last but not least, there is a 1, 3, 5, 2, 4, 6 string picking cycle that occurs under the 2nd & 3rd fingers of the fretting hand when all the notes are placed in either chromatic or alphabetical order. The picking hand, fingers or plectrum, simply takes advantage of this cycle. Enjoy