Guitar Chords Explained: The Complete Reference to Shapes, Voicings, and Theory

A guitar chord is a group of notes played simultaneously to create harmony. Chords are built from stacked intervals (the distances between notes) and are categorized by their function and color — major (bright), minor (dark), dominant (tension), suspended (open), and extended (rich). Understanding chord shapes, voicings, and theory unlocks the ability to accompany any song, improvise, and compose music.

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Quick Reference: Chord Essentials

Concept	Definition	Sound Character	Difficulty
Major chord	Root + major third + perfect fifth	Bright, resolved, happy	Easy
Minor chord	Root + minor third + perfect fifth	Dark, introspective, sad	Easy
Dominant 7th	Major triad + minor seventh	Tense, bluesy, demands resolution	Intermediate
Major 7th	Major triad + major seventh	Sophisticated, jazz-like, open	Intermediate
Suspended (sus)	Root + second or fourth (no third)	Ambiguous, open, unresolved	Intermediate
Diminished	Root + minor third + diminished fifth	Tense, dark, rare	Intermediate
Augmented	Root + major third + augmented fifth	Mysterious, unsettling	Intermediate
Extended (9th, 11th, 13th)	Major/minor triad + add higher intervals	Lush, complex, sophisticated	Advanced
Inversion	Chord played with non-root note in bass	Same harmony, shifted balance	Intermediate
Voicing	Specific arrangement of chord notes across strings	Color, texture, playability vary	Variable

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Part 1: The Foundation – Building Chords from Intervals

All chords are built from intervals — the distances between notes. To understand chords, you must first understand intervals.

Intervals: The Building Blocks

An interval is the distance between two notes, measured in semitones (half-steps). Guitar has 12 semitones per octave.

The 12 semitones of an octave (starting from C):

C → C# → D → D# → E → F → F# → G → G# → A → A# → B → (C)
1 → 2 → 3 → 4 → 5 → 6 → 7 → 8 → 9 → 10 → 11 → 12 → (1 octave)

Common intervals and their semitone distances:

• Unison (0 semitones): Same note played twice.
• Minor second (1 semitone): Dissonant, tense. Ex: C to C#.
• Major second (2 semitones): Pleasant, open. Ex: C to D.
• Minor third (3 semitones): Dark, introspective. Core of minor chords.
• Major third (4 semitones): Bright, resolved. Core of major chords.
• Perfect fourth (5 semitones): Open, stable. Common in sus chords.
• Tritone (6 semitones): Dissonant, “the devil’s interval.” Rare in chords.
• Perfect fifth (5 semitones from root, or 7 total): Stable, core of all triads.
• Minor sixth (8 semitones): Warm, melancholic.
• Major sixth (9 semitones): Bright, sophisticated.
• Minor seventh (10 semitones): Bluesy, demands resolution.
• Major seventh (11 semitones): Sophisticated, jazz-like.
• Octave (12 semitones): Same note, higher pitch.

Understanding these intervals visually on the fingerboard is essential. For example:

• A major third is always 4 semitones (or frets) away from the root.
• A perfect fifth is always 7 semitones away.
• A minor seventh is 10 semitones away.

Once you know these distances, you can play any chord shape anywhere on the neck.

→ See also: Understanding Intervals for Guitar

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Part 2: Triads – The Three-Note Foundation

A triad is a three-note chord built from stacked thirds (intervals of three letter names). All basic chords are triads; extended chords are triads with added notes.

Major Triads

A major triad consists of:

• Root (the chord’s name note)
• Major third (4 semitones up)
• Perfect fifth (7 semitones up from the root, or 3 semitones up from the third)

Example: C major (C–E–G)

C (root) → E (major third, 4 semitones) → G (perfect fifth, 3 more semitones)

Sound character: Bright, resolved, “happy.” The most common chord type in popular music.

How it sounds on guitar: Play the three notes together (or as an arpeggio) and you’ll hear the unmistakable “major” sound.

Minor Triads

A minor triad consists of:

• Root
• Minor third (3 semitones up — one semitone lower than major)
• Perfect fifth (7 semitones up from the root)

Example: C minor (C–Eb–G)

C (root) → Eb (minor third, 3 semitones) → G (perfect fifth, 4 more semitones)

Sound character: Dark, introspective, melancholic. The single change (major third → minor third) radically shifts the emotional quality.

Why this matters: The major/minor distinction is the most fundamental in music. Countless songs toggle between major and minor chords on the same root (e.g., C major to C minor) to shift emotional tone.

Diminished Triads

A diminished triad consists of:

• Root
• Minor third (3 semitones up)
• Diminished fifth (6 semitones up from the root — one semitone lower than a perfect fifth)

Example: C diminished (C–Eb–Gb)

Sound character: Tense, dark, unstable. Diminished chords feel like they need to resolve to another chord. Common in jazz and classical music; rare in pop and rock.

→ See also: What Is a Diminished Chord?

Augmented Triads

An augmented triad consists of:

• Root
• Major third (4 semitones up)
• Augmented fifth (8 semitones up from the root — one semitone higher than a perfect fifth)

Example: C augmented (C–E–G#)

Sound character: Mysterious, unsettling, “floating.” Augmented chords have no gravitational pull toward resolution; they sound suspended or dreamy. Rare in traditional pop but used in jazz and contemporary music for texture.

→ See also: Augmented Chords Explained

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Part 3: Seventh Chords – Adding Color and Tension

When you add a seventh interval (a note seven letter names above the root) to a triad, you create a seventh chord. Seventh chords add sophistication and harmonic interest.

Dominant 7th (Major Triad + Minor Seventh)

A dominant 7th chord is:

• Major triad (root, major third, perfect fifth)
• + Minor seventh (10 semitones up from root)

Example: C7 (C–E–G–Bb)

Sound character: Bluesy, tense, propulsive. The dominant 7th creates harmonic tension that “wants” to resolve down a fifth to another chord (e.g., C7 resolves to F). This is one of the most important chord types in blues, rock, and pop.

Why it’s called “dominant”: In music theory, the “dominant” chord (the V chord in a key) traditionally precedes the tonic (I chord). Adding a 7th to the V chord intensifies this pull.

Musical application: Blues songs often use dominant 7ths on all three chords. Jazz uses them extensively. Pop/rock uses them for groove and energy.

→ See also: Dominant 7th Chords Explained

Major 7th (Major Triad + Major Seventh)

A major 7th chord is:

• Major triad (root, major third, perfect fifth)
• + Major seventh (11 semitones up from root)

Example: Cmaj7 (C–E–G–B)

Sound character: Sophisticated, open, “jazz-like.” The major 7th creates a bright, slightly open feeling (different from the resolved completeness of a major triad). Major 7th chords are elegant and sophisticated.

Musical application: Jazz standards, contemporary ballads, soul music. Often used to add sophistication to simple chord progressions.

Minor 7th (Minor Triad + Minor Seventh)

A minor 7th chord is:

• Minor triad (root, minor third, perfect fifth)
• + Minor seventh (10 semitones up from root)

Example: Cm7 (C–Eb–G–Bb)

Sound character: Dark, soulful, jazzy. The minor 7th is warmer and less tense than the dominant 7th. It’s common in funk, soul, jazz, and R&B.

Minor/Major 7th (Minor Triad + Major Seventh)

A minor/major 7th chord is:

• Minor triad (root, minor third, perfect fifth)
• + Major seventh (11 semitones up from root)

Example: Cm(maj7) (C–Eb–G–B)

Sound character: Exotic, sophisticated, unusual. This chord combines the darkness of a minor triad with the brightness of a major seventh. Rare but striking in jazz and contemporary music.

→ See also: Major 7th vs. Dominant 7th Chords

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Part 4: Suspended and Add Chords – Ambiguity and Color

Suspended and add chords replace or add the third, creating open, unresolved, or colorful sounds.

Suspended Chords (Sus2, Sus4)

A suspended chord removes the third (the note that makes a chord major or minor) and replaces it with either a second or a fourth.

Sus2 (root + major second + perfect fifth):

• Example: Csus2 (C–D–G)
• Sound: Open, bright, unresolved.

Sus4 (root + perfect fourth + perfect fifth):

• Example: Csus4 (C–F–G)
• Sound: Open, ambiguous, stable but unresolved.

Why they’re called “suspended”: The third is “suspended” (held back) and typically resolves to a major or minor third for completion. Csus4 → Cmaj, for example.

Musical application: Pop songs often use sus chords for dynamic variation (verse in sus4, chorus resolves to major). Also used in rock for open, atmospheric sounds.

→ See also: What Is a Suspended Chord Resolution?

Add Chords (Add9, Add11, Add13)

An add chord keeps the triad intact and adds a higher interval without implying a seventh.

Add9 (root + major third + perfect fifth + major ninth):

• Example: Cadd9 (C–E–G–D)
• Sound: Bright, modern, open. Very popular in contemporary pop and indie music.

Add11 (root + major third + perfect fifth + perfect eleventh):

• Example: Cadd11 (C–E–G–F)
• Sound: Sophisticated, jazzy, unusual.

Key difference from 7th chords: An add9 chord has no seventh, giving it an open, unresolved quality different from a maj7 or dom7.

Musical application: Singer-songwriter and indie music frequently use add9 chords for color and sophistication without jazz complexity.

→ See also: What Is an Add9 Chord?

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Part 5: Chord Inversions – Changing the Bass Note

An inversion occurs when a note other than the root is the lowest note of the chord. Inversions don’t change the chord’s identity but shift its balance and flavor.

Root Position

The chord is in root position when the root is the lowest note.

Example: C major in root position

C (lowest) – E – G

This is the “standard” form of a chord and sounds grounded, stable.

First Inversion

The chord is in first inversion when the third is the lowest note.

Example: C major in first inversion (written as C/E)

E (lowest) – G – C

The chord still functions as C major but sounds lighter, more flowing. First inversions are common in chord progressions to create smooth bass lines.

Second Inversion

The chord is in second inversion when the fifth is the lowest note.

Example: C major in second inversion (written as C/G)

G (lowest) – C – E

Second inversions sound open and suspended. They’re less common than root position or first inversion but create beautiful harmonic effects in classical and contemporary music.

Slash Chords (Specific Bass Notes)

A slash chord notation (e.g., C/F) indicates a chord with a specific bass note that’s not part of the basic triad.

Example: C major with F in the bass (C/F)

F (lowest, not in C major triad) – C – E – G

Slash chords allow precise bass line control and create specific harmonic colors. Common in contemporary songwriting for subtle voice leading.

→ See also: Understanding Chord Inversions and What Is a Slash Chord?

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Part 6: Voicings – How to Play Chords on Guitar

A voicing is a specific arrangement of chord notes across the guitar’s strings. The same chord can have dozens of voicings, each with a different sound and feel.

Open Position Voicings

Open chords use open strings (strings played without fretting) to create ringing, resonant sounds. These are the first chords most guitarists learn.

Example: C major (open position)

String 6 (E): Muted
String 5 (A): 3rd fret (C)
String 4 (D): 2nd fret (E)
String 3 (G): Open (G)
String 2 (B): 1st fret (C)
String 1 (e): Open (E)

Result: C–E–G–E–C–E (multiple doublings and octaves)

Open voicings are bright, ringing, and beginner-friendly. Most acoustic guitar songs use open chord voicings.

Barre Chords

Barre chords use the index finger to press multiple strings at the same fret, allowing movable chord shapes that can be played anywhere on the neck.

Example: F major (full barre, 1st fret)

The index finger barres (holds down) all six strings at the 1st fret, then other fingers shape an E major pattern (shifted one fret higher). The result is F major on the 1st fret, Gb on the 2nd, G on the 3rd, etc.

Barre chords are harder to play (require finger strength) but unlock the ability to play any chord shape at any pitch.

→ See also: Barre Chords Explained: Why They’re Hard and How to Master Them

Extended Voicings (Closed vs. Open)

Closed voicings (all chord notes in the span of one octave) sound compact and sophisticated. Common in jazz.

Open voicings (chord notes spread over two or more octaves) sound airy and contemporary. Common in singer-songwriter and indie music.

The same chord (e.g., Cmaj7) sounds dramatically different in a closed vs. open voicing:

• Closed: Tight, focused, sophisticated.
• Open: Spacious, contemporary, ethereal.

Drop 2 and Drop 3 Voicings

Advanced guitarists use drop voicings — systematic ways of restructuring chord notes to create specific sonic effects.

Drop 2: Take a four-note chord, drop the second-highest note down an octave. Creates smooth jazz voicings.

Drop 3: Take a four-note chord, drop the third-highest note down an octave. Creates different jazz voicings.

Drop voicings are common in jazz and contemporary music but require understanding of chord construction.

→ See also: What Is a Drop 2 Voicing? and Chord Voicing Techniques

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Part 7: Chord Function and Harmony

Beyond individual chord identity (major, minor, 7th, etc.), chords have harmonic functions — roles they play in a key and the listener’s harmonic expectations.

The Three Core Functions

Tonic (I chord): Home, resolution, stability. In C major, C major is the tonic. Songs typically start and end on the tonic.

Subdominant (IV chord): Departure, forward motion. In C major, F major is the subdominant. It creates movement away from home.

Dominant (V chord): Tension, expectation. In C major, G major (or G7) is the dominant. It creates tension that expects resolution back to the tonic.

Example in C major:

I (C major) → IV (F major) → V (G major) → I (C major)
Tonic → Departure → Tension → Resolution

This I–IV–V–I progression is one of the most common in popular music.

Diatonic Chords

In any major key, there are seven diatonic chords (chords built from the key’s notes):

In C major:

• I: C major (C–E–G)
• ii: D minor (D–F–A)
• iii: E minor (E–G–B)
• IV: F major (F–A–C)
• V: G major (G–B–D)
• vi: A minor (A–C–E)
• vii°: B diminished (B–D–F)

Every chord in this key has a function. The most commonly used are I, IV, V, and vi.

Musical application: Understanding diatonic chords lets you transpose songs (move them to different keys) and create chord progressions that feel natural and resolved.

→ See also: Diatonic Chords Explained and Understanding Chord Function: Tonic, Subdominant, Dominant

Secondary Dominants

A secondary dominant is a V7 chord built on scale degrees other than the root. It creates momentary tension to a non-tonic chord before resolving.

Example: In C major, G7 (V7 in C) resolves to C. But a secondary dominant like D7 (V7 of G) creates tension toward G without resolving to C.

Secondary dominants add sophistication and chromatic movement to chord progressions. Common in jazz and sophisticated pop.

→ See also: Secondary Dominants Explained

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Part 8: Building Chord Progressions

A chord progression is a sequence of chords. Understanding progressions — how chords move between each other — is essential for songwriting and arrangement.

The I–IV–V–I Progression (The Cornerstone)

The I–IV–V–I progression appears in countless songs across genres (pop, rock, folk, country). It’s the archetypal chord progression.

In C major: C – F – G – C

This progression balances stability (I), departure (IV), tension (V), and resolution (I). It feels complete and satisfying.

Songs using this or similar:

• “Wild Thing” (I–V–I)
• “Sweet Home Chicago” (I–IV–V)
• “Wonderwall” (Em7–Asus2 progression, similar function)

The vi–IV–I–V Progression (Modern Pop)

A modern alternative popular in contemporary pop and indie:

In C major: A minor – F major – C major – G major

This progression swaps the vi (A minor) for the tonic at the start, creating a more introspective opening before climbing to resolution. This progression has become ubiquitous in singer-songwriter and pop music.

Songs using this: Countless modern pop and indie songs.

→ See also: The I-IV-V Progression Explained

Chord Substitution

Chord substitution replaces one chord with another that has similar harmonic function or color.

Common substitutions:

• vi replaces I: A minor can substitute for C major (same notes, different order).
• ii replaces IV: D minor can substitute for F major (adjacent in function).
• iii replaces I: E minor can substitute for C major (related key).

Substitution creates harmonic interest and color while maintaining the progression’s basic movement.

→ See also: What Is Chord Substitution?

Voice Leading

Voice leading is the art of moving between chords with minimal finger movement and smooth note connections. Good voice leading sounds natural and singable.

Example: Moving from C major to F major, keep the E and G common to both chords, moving only the C to C (or F, depending on voicing). This creates smoothness.

Voice leading is subtle but transforms a choppy progression into flowing music.

→ See also: What Is Voice Leading in Chord Progressions?

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Part 9: Modes and Chord Color

Modes (Ionian, Dorian, Phrygian, Lydian, Mixolydian, Aeolian, Locrian) are scales derived from major scales, each starting on a different scale degree. Each mode has associated chords that reflect its unique color.

Dorian Mode

Dorian is the minor mode with a raised sixth (compared to natural minor). It sounds jazzy and soulful.

In C Dorian (relative to Bb major): C–D–Eb–F–G–A–Bb–C

Chords in Dorian mode have a minor character but with major sixth intervals (e.g., Cm6, Cm7). This creates the characteristic Dorian sound.

Musical application: Jazz, funk, R&B, folk music.

Mixolydian Mode

Mixolydian is major with a lowered seventh. It sounds bluesy and rock-oriented.

In C Mixolydian (relative to F major): C–D–E–F–G–A–Bb–C

Dominant 7th chords are characteristic of Mixolydian (e.g., C7, C dominant). This mode captures the bluesy, rock-oriented quality.

Musical application: Blues, rock, funk.

→ See also: Modes Explained: Ionian to Locrian for Guitar

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Part 10: Practical Chord Application

Understanding chord theory is valuable, but applying it to real songs is where the skill develops.

Transposition

Transposition is moving a song from one key to another. With chord understanding, this is simple: if a song is in G major (I–IV–V–I = G–C–D–G) and you want to play it in C major, the progression becomes C–F–G–C.

Why transpose? To match a singer’s vocal range, to avoid difficult chord shapes, or to create new interpretations of familiar songs.

→ See also: Understanding Transposition

Capo Theory

A capo is a device that clamps across all strings at a specific fret, raising the pitch of open strings. Understanding chords and transposition makes capo use intuitive.

Example: A song in Gb major with difficult barre chords can be played with a capo at the 1st fret using G major shapes (much easier).

→ See also: Capo Theory: How to Use a Capo Effectively

Song Analysis

Learning to identify chords in songs by ear (or from charts) is a critical skill. Understanding chord function helps: listen for the tonic, find the dominant movement, recognize substitutions.

Step-by-step song analysis:

1. Identify the key.
2. Recognize the tonic chord (usually the first and last chord).
3. Map the progression in Roman numerals (I, IV, V, vi, etc.).
4. Look for patterns (common progressions, substitutions, secondary dominants).

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Part 11: Extended Chords and Jazz Voicings

Extended chords (9th, 11th, 13th) add sophistication and are common in jazz, contemporary ballads, and advanced pop music.

9th Chords

A 9th chord adds the ninth (one octave plus a major second from the root) to a seventh chord.

Example: C9 (C–E–G–Bb–D)

Sounds: Open, colorful, sophisticated. The 9th adds brightness above the 7th.

11th Chords

An 11th chord adds the eleventh (one octave plus a perfect fourth) to a ninth chord.

Example: C11 (C–E–G–Bb–D–F)

Sounds: Complex, jazzy, rich. The 11th adds a harmonic tension (dissonance with the 3rd) that requires careful handling.

13th Chords

A 13th chord adds the thirteenth (one octave plus a major sixth) to an 11th chord.

Example: C13 (C–E–G–Bb–D–F–A)

Sounds: Lush, sophisticated, complex. The 13th adds the most extension possible while keeping all intervals in one octave.

Common 13th voicing: Omit the 11th to avoid clashing with the 3rd, creating C13 (C–E–G–Bb–D–A). This is a very sophisticated, soulful sound.

→ See also: What Is a Chord Extension (9th, 11th, 13th)?

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Part 12: Common Mistakes and Misunderstandings

Mistake 1: Confusing Add and 7th Chords

Add9 (C–E–G–D) has no 7th and sounds open and modern.

Maj7 (C–E–G–B) has a major 7th and sounds jazzy.

The presence or absence of the seventh changes the chord’s color completely.

Mistake 2: Thinking All Chords Must Be “Perfect”

Voicings don’t need to include all chord tones. A simple voicing with only root, third, and fifth often sounds better than cramming all extensions into limited guitar strings.

Less is often more.

Mistake 3: Ignoring Voice Leading

Moving between chords with large finger jumps sounds choppy. Good voice leading keeps common tones and minimizes hand movement. This is subtle but makes the difference between beginner-sounding and professional-sounding progressions.

Mistake 4: Memorizing Shapes Without Understanding

Memorizing chord shapes without understanding how they’re built (what intervals they contain) limits growth. Learn theory alongside shapes; it accelerates mastery.

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Conclusion: From Theory to Music

Chord theory might seem abstract — intervals, functions, voicings, extensions. But every theory concept exists to serve one goal: creating music that resonates emotionally with listeners.

When you understand that a major seventh chord adds sophistication, or that a secondary dominant creates expectation, or that voice leading creates smoothness — theory stops being abstract and becomes a toolkit for expression.

The progression from beginner (memorizing C, G, D shapes) to intermediate (understanding why Cmaj7 sounds different from C7) to advanced (using drop voicings and secondary dominants) is a gradual internalization of principles you’ll use for the rest of your musical life.

Every chord progression you hear on the radio, every song you learn, every composition you write will use these foundational concepts. Theory is not separate from music — it’s the underlying structure that makes music work.

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Internal Link Callouts for WikiWriter Bulk Import

Link graph for this pillar (embed in import payload):

1. Understanding Intervals for Guitar
2. What Is a Diminished Chord?
3. Augmented Chords Explained
4. Dominant 7th Chords Explained
5. Major 7th vs. Dominant 7th Chords
6. What Is a Suspended Chord Resolution?
7. What Is an Add9 Chord?
8. Understanding Chord Inversions
9. What Is a Slash Chord?
10. Barre Chords Explained: Why They’re Hard and How to Master Them
11. What Is a Drop 2 Voicing?
12. Chord Voicing Techniques
13. Understanding Chord Function: Tonic, Subdominant, Dominant
14. Diatonic Chords Explained
15. Secondary Dominants Explained
16. The I-IV-V Progression Explained
17. What Is Chord Substitution?
18. What Is Voice Leading in Chord Progressions?
19. Modes Explained: Ionian to Locrian for Guitar
20. Understanding Transposition
21. Capo Theory: How to Use a Capo Effectively
22. What Is a Chord Extension (9th, 11th, 13th)?

 

 

FAQ

What is the difference between a chord shape and a chord voicing?

A chord shape refers to the finger placement pattern on the fretboard, while a voicing describes which notes of the chord are selected and how they are distributed across strings.

How do I move a chord shape to a different key?

Because intervals are consistent across the neck, you can slide the entire shape up or down the same number of frets to transpose the chord while preserving its quality.

When should I use a suspended chord?

Suspended chords replace the third with a second or fourth, creating an open, unresolved sound that works well for building tension before resolving to a major or minor chord.

What makes a dominant 7th chord sound “bluesy”?

The combination of a major triad with a minor seventh creates tension that naturally resolves to the tonic, a hallmark of blues progressions.

Why are extended chords (9th, 11th, 13th) considered advanced?

They add higher intervals beyond the seventh, requiring knowledge of chord construction and careful voice leading to avoid dissonance.