Zone 1 — Am — Piano Keyboard

Chord tones across two octaves. Five-finger position puts [3] and [7] under your fingers naturally.
A — Root [1]
C — Minor 3rd [3]
E — Perfect 5th [7]
Non-chord white key
Non-chord black key
five-finger position (A–E)
A C E [3] minor 3rd modal, dark — the minor quality [4] major 3rd modal, light — quality within the 5th [7] perfect 5th — perfect, light — open stability

Five-Finger Position — A Minor

Thumb
Aroot
1
→
Index
Bstep
2
→
Middle
C[3]
3
→
Ring
Dstep
4
→
Pinky
E[7]
5

In five-finger position, your thumb sits on A (root). Your middle finger naturally lands on C (the minor 3rd — [3]). Your pinky reaches E (the 5th — [7]). The [3] di-chord is built into the physical hand position.

Am Chord — Left Hand (Root Position)

Aroot
C[3]
E[7]

Am Chord — Right Hand (Root Position)

Aroot
C[3]
E[7]

Zone 1 — Am — Guitar vs. Piano Position Reference

Note Role Interval Label Di-chord Quality Guitar (string/fret) Piano (key) Five-Finger (finger)
A Root [1] — 5th string, open (A2) · 4th string, 7th fret (A3) · 1st string, 5th fret (A4) A3 · A4 (highlighted purple) Thumb (1)
C Minor 3rd [3] modal, dark — the minor quality 5th string, 3rd fret (C3) · 2nd string, 1st fret (C4) · 3rd string, 5th fret (C4) C4 · C5 (highlighted medium purple) Middle (3)
E Perfect 5th [7] perfect, light — open stability 6th string, open (E2) · 4th string, 2nd fret (E3) · 1st string, open (E4) E3 · E4 (highlighted green) Pinky (5)
B Step — passing / tension 2nd string, open (B3) · 5th string, 2nd fret (B2) B3 · B4 (white, unmarked) Index (2)
D Step — passing / resolution target 4th string, open (D3) · 2nd string, 3rd fret (D4) D3 · D4 (white, unmarked) Ring (4)