Altered Chords Guitar: A Complete Guide for Players

Altered chords on guitar are chords that contain modified notes, usually by raising or lowering certain chord tones to create extra tension, color, and movement. They are commonly used in jazz, fusion, and advanced songwriting, but guitarists in many styles can use them to make progressions sound more expressive.

Unlike basic major or minor chords, altered chords create a feeling of instability that often wants to resolve to another chord. This tension-and-release effect is one reason they are powerful tools for creating interesting harmony.

What Are Altered Chords on Guitar?

An altered chord is usually a dominant seventh chord with one or more altered extensions changed by a half step.

For example, a regular dominant seventh chord contains:

C7 = C – E – G – Bb

An altered version may change the upper notes:

C7♭9 = C – E – G – Bb – Db
C7#9 = C – E – G – Bb – D#

The root, third, and seventh usually remain the same because they define the chord’s function. The altered notes add tension and create a unique sound.

Altered chords are especially common before a chord resolution. In many cases, a dominant altered chord creates strong movement toward the tonic chord.

Altered Chords vs Extended Chords

Altered chords and extended chords are related but serve different purposes.

Chord Type	What Changes?	Example	Sound
Extended chord	Adds higher chord tones	C9, C11, C13	Rich and colorful
Altered chord	Changes existing extensions	C7♭9, C7#9	Tense and expressive

An extended chord adds notes from the scale above the seventh. An altered chord modifies those notes by raising or lowering them.

For example:

C9:
C – E – G – Bb – D

C7♭9:
C – E – G – Bb – Db

The D becomes Db, creating a more tense sound.

You can learn more about related harmony concepts in this guide to extended chords on guitar.

Common Types of Altered Chords

Flat Ninth Chords (♭9)

A flat ninth lowers the ninth note by one semitone.

Example:

C7♭9

Notes:

C – E – G – Bb – Db

The ♭9 creates a dark, tense sound and is often used in jazz, blues, and dramatic musical moments.

Common uses:

• Dominant chord resolution
• Jazz progressions
• Creating suspense

Sharp Ninth Chords (#9)

The sharp ninth creates a distinctive bluesy and aggressive sound.

Example:

C7#9

Notes:

C – E – G – Bb – D#

The #9 chord became famous in rock and blues because it combines a major third with a raised ninth, creating a strong contrast.

Flat Fifth Chords (♭5)

A flat fifth lowers the fifth of the chord.

Example:

C7♭5

Notes:

C – E – Gb – Bb

This creates a more unstable and modern sound.

Sharp Fifth Chords (#5)

A sharp fifth raises the fifth by one semitone.

Example:

C7#5

Notes:

C – E – G# – Bb

This chord creates a feeling of movement and tension, making it useful for transitions.

Why Guitarists Use Altered Chords

Altered chords are useful because they add emotional depth to simple progressions.

They can create:

More Tension

A regular dominant chord already creates a desire to resolve. Altered notes increase that tension.

Example:

G7 → C

becomes:

G7♭9 → C

The altered version creates stronger movement toward C major.

More Color

Simple major and minor chords can sound predictable. Alterations add unexpected colors while keeping the original chord function.

More Expression

Songwriters and guitarists use altered chords to create moods such as:

• Mystery
• Sophistication
• Drama
• Excitement
• Emotional intensity

How to Use Altered Chords in Songs and Progressions

Altered chords work best when they have a clear purpose. They are usually not used randomly.

Use Them Before Resolution

The most common use is replacing a dominant chord before the tonic.

Example:

Basic progression:

Dm7 → G7 → Cmaj7

Altered version:

Dm7 → G7♭9 → Cmaj7

The altered G chord creates stronger anticipation before resolving to C.

Add Them to Song Sections

Altered chords can make certain sections stand out.

For example:

• Use simple chords in verses
• Add altered chords in bridges or transitions
• Create more tension before a chorus

Experiment With Chord Voicings

On guitar, the same altered chord can sound different depending on which notes are emphasized.

Different guitar chord voicings can make altered chords easier to play and more musical.

Beginner Tips for Learning Altered Chords

Altered chords can seem complicated at first, so start gradually.

Learn Dominant Seventh Chords First

Before learning altered versions, understand basic dominant chords such as:

• C7
• G7
• D7
• A7

These provide the foundation for altered harmony.

Learn One Alteration at a Time

Start with common sounds:

1. Dominant 7th chords
2. 7♭9 chords
3. 7#9 chords
4. 7#5 and 7♭5 chords

Listen to the Function

Do not focus only on memorizing shapes. Listen for how the chord creates tension and where it wants to go.

A useful way to practice is:

1. Play a normal dominant chord.
2. Play the altered version.
3. Resolve both to the tonic chord.
4. Compare the emotional effect.

You can also explore different chord examples using a guitar chord dictionary.

Are Altered Chords Only Used in Jazz?

No. Although altered chords are strongly associated with jazz harmony, they appear in many musical styles.

They can be found in:

• Jazz
• Blues
• Rock
• Soul
• R&B
• Film music
• Modern songwriting

The difference is usually how frequently they are used. Jazz often uses altered harmony as a regular part of chord movement, while other styles may use it occasionally for special effects.

Frequently Asked Questions

What is an altered chord in guitar?

An altered chord is a chord where one or more notes, usually extensions above the seventh, are raised or lowered to create extra tension and color.

Are altered chords only used in jazz?

No. Jazz uses them frequently, but altered chords can also appear in blues, rock, R&B, and songwriting when musicians want a more expressive sound.

What is the difference between altered and extended chords?

Extended chords add notes such as the 9th, 11th, or 13th, while altered chords modify those notes by raising or lowering them.

Which altered chords should beginners learn first?

Beginners should start with dominant seventh chords, then learn common alterations such as 7♭9 and 7#9 because they are widely used and easier to understand.