The CAGED System

Fretboard · Shapes · Keys

SMM-200 — Systems

The CAGED FrameworkSMM-201

SMM-202 — The Five Shapes

C ShapeSMM-202

A ShapeSMM-203

G ShapeSMM-204

E ShapeSMM-205

D ShapeSMM-206

SMM-207 — Putting It Together

The Chain — All Five ConnectedSMM-207

Playing in Any KeySMM-208

SMM-209 — Deeper Systems

3-Note-Per-String SystemSMM-209

Relative Keys ReferenceSMM-210

The CAGED Framework

SMM-201 · What It Actually Is

The guitar neck is not a random collection of notes. It is the same twelve pitches repeating, organized into a system. CAGED is how you see that system.

The name comes from five open chord shapes: C, A, G, E, D. You already know these as beginner chords. CAGED says: those five shapes are not just beginner chords. They are the five lenses through which the entire fretboard is organized.

    Every note on the neck belongs to one of five positions. Every scale pattern, every arpeggio, every chord voicing — all of it lives inside one of these five shapes. Learn the shapes, and the fretboard stops being a mystery.
  

The Myth You Need to Kill First

Most players learn box patterns — a cluster of notes in a fixed position — and call it CAGED. That is not CAGED. Those patterns exist inside CAGED, but the box alone is not the system.

CAGED is the chord shape living underneath the scale pattern. When you play a box at the 5th position, there is an A shape chord embedded in those notes. That chord is your anchor. That is what CAGED is teaching you to see.

The actual insight: Chord tones live inside every scale shape. When you solo over a G chord using the G shape position, you are already playing the chord tones by default. Your melody is harmonically connected — not by accident, but by the structure of the shape.

Root Anchors — The Three Strings That Matter

Each shape has a root note anchor on a specific string. Find that anchor, and you find your key. Move the whole shape up or down the neck to change key.

C Shape

Root on A string

A Shape

Root on A string

G Shape

Root on E strings

E Shape

Root on E strings

D Shape

Root on D string

How the Shapes Connect

The five shapes tile the entire neck without gaps. They appear in CAGED order as you move up the fretboard. The end of one shape overlaps slightly with the beginning of the next — that overlap is where the shapes connect, and where position shifts happen naturally.

In the next five sections, you will learn each shape individually. After that, the chain page shows all five locked together on a single key across the full neck.

The C Shape

SMM-202 · Root on the A String

The C shape is built around the open C major chord. When you know this chord, you already know the frame. Everything else — the scale, the arpeggios, the extensions — lives inside this same geometric outline.

Open C Major

Root

A string

Open Key

C major

Low E

Not used

The root lives on the A string. In open position, the A string third fret is C. To play this shape in G, slide until the A string root lands at G — fifth fret.

Major Scale in the C Shape Position

Key of C, open position. Root notes marked in orange.

Root

Scale tone

e ──0──1──3──────────────────

B ──0──1──3──────────────────

G ──0──2──────────────────────

D ──0──2──3──────────────────

A ──0──2──3── ← root at 3

E ──────────── (not used)

What you're hearing: The low E string is muted in the C chord, but the E note (open) is part of C major. In open position you can include it. Once you slide this shape up the neck as a barre, the low E becomes the shape's lowest note and you do use it.

Chord Tones Inside the Shape

Within the C shape, the chord tones (C, E, G) appear at predictable positions. Your melody lines that land on those positions will sound like they belong — because they do. This is the structural advantage CAGED gives you over just playing random pentatonic boxes.

The A Shape

SMM-203 · Root on the A String

The A shape shares its root string with the C shape — both anchor on the A string. The difference is the geometry. The A shape's three middle strings (D, G, B) all fret at the same position, making it one of the most physically efficient barre shapes on the guitar.

Open A Major

Root

A string

Open Key

A major

Low E

Not used

Root is on the A string, open. As a barre chord, the root moves with your index finger. A shape barre at the 5th fret = D major. At the 7th fret = E major.

Major Scale in the A Shape Position

Key of A, open position. This pattern moves intact up the neck.

Root

Scale tone

e ──0──2──4──5──────────────

B ──2──4──5──────────────────

G ──1──2──4──────────────────

D ──0──2──4──────────────────

A ──0──2──4── ← root open

E ──────────── (not used)

The bar chord version: Barre your index across all six strings at any fret. Your middle, ring, and pinky form the same A shape two frets up. The high e string rings open in open position — when barring, it's covered by the index. Both produce the major triad.

The A Shape in Rock Context

The A shape barre chord is the most common power chord extension. When you play a barre at the 5th fret (D), your index is already holding the CAGED anchor. Everything around that barre — the scale run, the lick, the turnaround — lives in the A shape framework.

The G Shape

SMM-204 · Root on Both E Strings

The G shape is the widest of the five — it spans four frets and places the root on both the low and high E strings simultaneously. This double root makes it easy to hear the tonal center from both ends of the guitar's range at the same time.

Open G Major

Root

Low E + high e

Open Key

G major

Width

4 frets

In open position: low E at fret 3 and high e at fret 3 are both G. As you move up the neck, these two root positions stay symmetrical — same fret on both outer strings.

Major Scale in the G Shape Position

Key of G, open position. The wide span of this shape requires a deliberate stretch — index and pinky will both be working.

Root

Scale tone

e ──3──5── ← root at 3

B ──3──5──────────────────────

G ──4──5──────────────────────

D ──2──4──5──────────────────

A ──2──3──5──────────────────

E ──3──5── ← root at 3

The stretch: The G shape is often the most challenging to barre cleanly because of its 4-fret width. Most players use it in its open form and avoid the full barre — instead using the individual chord tones as targets when soloing.

Why the G Shape Matters for Lead

The G shape position sits between the A shape and the E shape in the CAGED chain. When you are soloing in this position, you have the root note on both outer strings as landmarks — a natural ceiling and floor for your phrasing. Use them.

The E Shape

SMM-205 · Root on Both E Strings

The E shape is the first chord most guitarists ever learn, and it is also the foundation of nearly every barre chord in rock. When you slide an open E up the neck with your index barring, you have the E shape. The root is on the low E string — the deepest, most resonant note available.

Open E Major

Root

Low E + high e

Open Key

E major

Barre Use

Universal

E shape barre at the 2nd fret = F#. At the 5th = A. At the 7th = B. This is the most common barre chord movement in rock. The shape travels up the neck intact.

Major Scale in the E Shape Position

Key of E, open position. Clean and symmetrical — this is why it is the most intuitive shape for single-note runs.

Root

Scale tone

e ──0──2──4── ← root open

B ──0──2──4──────────────────

G ──1──2──4──────────────────

D ──2──4──────────────────────

A ──2──4──────────────────────

E ──0──2──4── ← root open

The symmetry: Notice that the low E and high e strings have identical patterns. This gives the E shape a natural anchor at both ends — root on the bottom, root on the top. When you run a scale through this shape, you always know where you started and where you ended.

E Shape as Default Lead Position

When guitarists talk about "playing out of the E shape," they usually mean the pentatonic minor box at that position — which is contained inside the full major scale E shape. Connecting the pentatonic shape back to the E shape chord frame is how you stop playing boxes and start playing over the chord.

The D Shape

SMM-206 · Root on the D String

The D shape is the most compact of the five. Its root is on the D string — the fourth string — which means the two lowest strings (low E and A) are not part of the chord. It is a high-voice shape, naturally bright, sitting at the top of the fretboard range when used in upper positions.

Open D Major

Root

D string

Open Key

D major

Low Strings

Not used

Root is on the D string (open in key of D). As you move up the neck, the D string root moves with you. D shape barre at the 2nd fret = E. At the 5th fret = G. At the 7th fret = A.

Major Scale in the D Shape Position

Key of D, open position. The highest voice of the five shapes.

Root

Scale tone

e ──2──3──5──────────────────

B ──3──5──────────────────────

G ──2──4──────────────────────

D ──0──2──4── ← root open

A ──────────── (not used)

E ──────────── (not used)

The D shape up the neck: When you reach the 10th–12th fret area in the key of G, you are in the D shape position. Many players do not recognize it because they have not seen it labeled. That upper-neck pentatonic box you already play? It is inside the D shape.

Completing the Chain

The D shape is the last of the five — but after D, the next shape up the neck is C again, one octave higher. The chain repeats indefinitely. You now have all five pieces. The next page shows them locked together across a single key.

The Chain

SMM-207 · All Five Connected

In the key of G, the five shapes cover the entire neck from open position to the 12th fret. Each shape's end overlaps with the next shape's beginning — that overlap is where you shift positions during a solo without breaking the phrase.

    Key of G — all five shapes across the neck. Every note shown is in G major. The shapes tile the fretboard without gaps and without repetition — until the 12th fret, where the cycle begins again one octave up.
  

G Shape — Open Position (Frets 0–4)

Root: G on low E (3rd fret) and high e (3rd fret). The natural home position for G major. This is where the open G chord lives.

E Shape — 3rd Position (Frets 2–7)

Barre the index at the 3rd fret. Root is now on the low E string at fret 3 = G. This is a G major chord in E shape. The E-shape scale pattern extends from about fret 2 up to fret 7.

D Shape — 7th Position (Frets 5–10)

Root: G on the D string, 5th fret. The scale pattern sits in the 5th–10th fret range. High positions — where the solos live in rock and blues.

C Shape — 10th Position (Frets 8–12)

Root: G on the A string, 10th fret. The C shape in the upper register. Chord tones (G, B, D) appear in predictable positions within this high-neck frame.

A Shape — 12th Position (Frets 10–14)

Root: G on the A string, 12th fret (octave G). The cycle completes here — and begins again. The A shape at fret 12 contains the same notes as the G shape at open, one octave higher.

The overlap is not a flaw. The shared notes between adjacent shapes are the connection points — the phrases that let you move smoothly from one position to the next without an audible seam. Experienced players exploit these overlaps deliberately.

Practice Directive

Choose one key. Play through all five shapes consecutively, ascending the neck. Then descend back through them. Do not think about scales — think about where the root note is in each position. The notes will follow.

Playing in Any Key

SMM-208 · Moving the Root

The shapes do not change. The key changes by moving the root. This is the entire mechanism. Once the shapes are in your fingers, every key is just a matter of finding the root note on the correct string for that shape.

    Find the root. Build the shape around it. That is the whole system. The 12 notes on the chromatic scale mean 12 possible positions for each shape. Five shapes × 12 keys = 60 positions. All of them are the same five physical shapes.
  

Root Note Reference — E and A Strings

The most useful strings to know are the low E and the A. These are the root anchors for the E shape and the C/A shapes respectively.

Fret	Low E String	A String
Open	E	A
1st	F	A# / B♭
2nd	F# / G♭	B
3rd	G	C
4th	G# / A♭	C# / D♭
5th	A	D
6th	A# / B♭	D# / E♭
7th	B	E
8th	C	F
9th	C# / D♭	F# / G♭
10th	D	G
11th	D# / E♭	G# / A♭
12th	E	A

Practical Shorthand

To play in any key, decide which shape you want to use, then find the root on the appropriate string. A shape in the key of D: go to the 5th fret of the A string. C shape in the key of F: go to the 8th fret of the A string. E shape in the key of B: go to the 7th fret of the low E string.

You do not need to know every note on every string right now. Know the E and A strings cold. The D string follows from the A string — it is always a fifth up (or a fourth down). Once you have E and A, the rest of the neck becomes derivable.

The One Practice That Changes Everything

Pick a song you know. Identify the key. Find the root on the low E string. Play the E shape barre chord. Now find it on the A string and play the A shape. Then the C shape. You just played the same chord three ways in three positions. That is the CAGED system working in real time.

3-Note-Per-String

SMM-209 · The Alternative System

CAGED organizes the fretboard vertically — around chord shapes that sit in a position. The 3-note-per-string system organizes it horizontally — across the neck in long, linear runs that connect positions fluidly.

Both systems map the same notes. The difference is how your hands and eyes perceive the fretboard.

    In 3-note-per-string: every string gets exactly three notes of the scale. You start from the lowest root note you can find, run the entire scale to the highest note, then play it back in reverse. Seven patterns. Seven starting points on the scale (one per mode). Same twelve notes, infinite fluency.
  

Why It Exists

CAGED shapes are compact and chord-centric. They are ideal for understanding harmony and voice leading. But the positional nature means long single-note runs across the neck require shifting — and that shift can break fluency.

3-note-per-string eliminates that. Every string move is predictable: three notes, same interval pattern, next string. High-speed lines across six strings become mechanical once the patterns are memorized.

The Pattern — G Major, Starting on E String

e ──────────────────── 10──12──14

B ──────────── 10──12──14──────────

G ──────9──11──12────────────────

D ──9──10──12────────────────────

A ──7──9──10──────────────────────

E ──7──9──10── ← root G at 7

Three notes per string. Consistent. Read left to right, low string to high. No position shifts. Run it up. Run it back down. That is the exercise.

3NPS vs. CAGED — When to Use Each

Situation	Use
Playing over a chord change	CAGED — stay connected to chord tones
Long ascending / descending runs	3NPS — linear momentum
Learning a new key	CAGED — root anchors make it fast
Technique development	3NPS — consistent picking pattern
Modal playing	3NPS — each mode has a natural starting pattern
Improvising over backing track	Both — use CAGED for position, 3NPS to exit

Practice directive: Start at the lowest root note on the low E string. Use strict alternate picking (down-up-down-up) through all six strings. At the top, come back down without stopping. Do it slowly enough that every note is clean, then push the tempo with a metronome.

Relative Keys

SMM-210 · Same Notes, Different Tonal Center

Every major key has a relative minor key. They share the exact same notes — the same scale, the same CAGED shapes, the same 3-note-per-string patterns. The only thing that changes is which note you treat as home.

    C major and A minor are relative keys. Every note in C major (C D E F G A B) is a note in A minor. The shapes do not change. Your ear decides whether C or A feels like the tonic.
  

Major / Relative Minor Pairs

Major Key	Relative Minor	Shared Notes
C major	A minor	C D E F G A B
G major	E minor	G A B C D E F#
D major	B minor	D E F# G A B C#
A major	F# minor	A B C# D E F# G#
E major	C# minor	E F# G# A B C# D#
B major	G# minor	B C# D# E F# G# A#
F major	D minor	F G A B♭ C D E

What This Means for CAGED

When you are in the E shape position for G major, you are simultaneously in the E shape position for E minor — the relative minor. The shapes do not move. Your phrasing resolves to E instead of G.

This is how players shift between major and minor feels in the same position. The pentatonic shape for G major and the pentatonic shape for E minor are the same shape. You already know this sound — now you know why it works.

Finding the relative minor: The relative minor root is always the 6th degree of the major scale — three semitones (frets) below the major root, or nine semitones above. In C major: count down three semitones from C to land on A. A minor is relative.

Application — Using Both in a Solo

Over a chord progression that sits in G major, emphasize G as the tonal center for a bright, resolved feel. Shift your emphasis to E and bend toward the minor pentatonic targets — the flat 7, the minor 3rd — for a darker, more aggressive sound. Same position. Same shape. Completely different emotional statement.

This is not theory for its own sake. It is the mechanism behind every guitarist who can play both "happy" and "dark" without moving their hand position. Now you know what they are doing.