Watch the I vi ii iii IV V: Area 4 online guitar lesson by Brad Carlton from Guitar Lab: CAGED Comping

This lesson covers the I vi ii iii IV V progression in the key of A in area four. The chords are A, F#m, Bm, C#m, D, and A. The C form from the CAGED system is used for the A chord, the A minor form from the EDCAG system is used for the F# minor chord, the D minor form from the EDCAG system is used for the B minor chord, the E minor form from the EDCAG system is used for the C# minor chord, the E form from the CAGED system is used for the D chord, and the G form from the CAGED system is used for the E chord.

The modes are as follows for each of the chords and its progression: Ionian for the I chord, 1 2 3 4 5 6 7; Aeolian for the vi chord, 1 2 b3 4 5 b6 b7, Dorian for the ii chord, 1 2 b3 4 5 6 b7; Phrygian for the iii chord, 1 b2 b3 4 5 b6 b7; Lydian for the IV chord, 1 2 3 #4 5 6 7; and Mixolydian for the V chord, 1 2 3 4 5 6 b7.

The arpeggios for these chords are labeled in red in the diagrams. The remaining four tones are labeled in black which then form the modes for each of these chords. Each of these chords have a pentatonic scale which is an extension of the arpeggio. For the A chord, add the 2 and the 6 to the major arpeggio to form the fifth string rooted major pentatonic scale. For the F# minor chord, add the 4 and the b7 to the minor arpeggio to form the fifth string rooted minor pentatonic scale. As you can see, the same pentatonic scale form serves for both chords. This is a rule: any two chords built from the major scale which are a third apart will share the same pentatonic scale form.

The third string root pentatonic scale will provide the B minor pentatonic scale for the B minor chord and the D major pentatonic scale for the D chord. The sixth string root pentatonic scale will provide the C# minor pentatonic scale for the C# minor chord and the E major pentatonic scale for the E chord. Be sure to memorize the formulas for your modes because then you will clearly see the pentatonic subscales that exist within them.