Universal A Guitar Maps are a unique way to learn and practice guitar scales in the key of a. GuitarMaps are a simple way to develop a better vision of the whole guitar fret board, allowing you to play solos anywhere on the guitar neck. Guitar Maps connect guitar scales together so you can follow them up and down the fret board. The Universal guitar maps can work for songs that are in a Major or a Minor key. A Minor guitar scales work with songs that have a Minor root note and the a Major scales are for songs that have a Major root note. These are great scales for playing blues, rock, metal, country and some jazz. Learning these fret board scale patters will open up a whole new world when it's time for you to play a guitar lead or solo.