Tuned to the Blues Scale, the Minor Pentatonic with the added Blue Note.Guitarists refer to this scale as playing in the box, and it is one of the first scales to learn. However, to play it on a standard harmonica you have to perfect advanced techniques that could take years to master. Thats where the PentaHarp comes in. It’s designed to make harp easy for guitarists and to give harp players a new approach.