Why this works musically
The power of this approach is that you are not thinking in complex scale shapes. Instead, you are using two simple triads:
A major triad = “inside” sound (stable, familiar)
Eâ™ major triad = “outside” sound (tension, altered color)
When combined, they naturally imply an A7â™9♯11 sound, which is very common in jazz, fusion, and modern improvisation.
How to use it on guitar
On the fretboard, triads are small and movable, so you can:
Play the A major triad in one position
Overlay or alternate with the Eâ™ triad shape.
Or arpeggiate between them to create tension and release
The real effect comes from switching between:
Inside (A triad) → sounds resolved
Outside (Eâ™ triad) → sounds tense and colorful
Here below a very basic exercise :