What is the Nashville Number System? It is probably the easiest, fastest method to transpose keys for people who play chords. For session players and jammers, it is the way to change keys instantly. Duck’s Deluxe explains and illustrates the Nashville Number System with a dial that shows the guitar chords and basic progressions. If you don’t play guitar, it doesn’t matter. All you have to do is use the chords for your own instrument and follow the chord progressions. This dial is indispensable for learning the Nashville number system. It’s a great time saver for those who work with vocalists, and need to change keys on the spot! For more information about this or other helpful guides for playing guitar, call us at 1-800-42-MUSIC, write us at email@example.com, or check out our website at www.stantons.com. Shop Stanton’s for all your sheet music needs.