Guitar Wheel - Suitable for Acoustic, Electric and Classical Guitar - Beginner to Advanced Major / Minor Guitar Chords in Key, use it to easily transpose and arrange music. The Guitar Wheel has a rotating front cover, displaying the 7 In Key chords in the open window. The Key is set by locating the Root or starting note or chord in the Number 1 position. The Outer Window displays the 3 In Key Major Chords. The Inner Window displays the 4 In Key Minor Chords.