Lydian Augmented Dominant Mode on Guitar: Notes, Chords & Examples

The Lydian Augmented Dominant mode is a bright, tense, futuristic dominant sound.

It has the open, floating quality of Lydian because of the #4, the unstable color of an augmented scale because of the #5, and the bluesy/fusion pull of a dominant 7th because of the b7.

On guitar, this mode sounds:

Modern
Sharp and colorful
Dominant but not traditional
Fusion-friendly
Progressive and slightly “alien”

If regular Mixolydian sounds earthy and bluesy, Lydian Augmented Dominant sounds like Mixolydian sent through a sci-fi jazz-fusion filter.

It is not a basic rock mode, but it is extremely useful for progressive rock, metal, fusion, film-score harmony, and advanced songwriting.

How does it sound?

Before anything else, let’s hear how it sounds. This can best be done by playing a chord from the mode, and playing the notes of the mode arpeggiated on top of it. This is the best and quickest way to determine the feel of a mode.

This can be quickly done using SLModes, a software dedicated to the music modes, and the following sound was generated by it:

Formula

The interval formula for C Lydian Augmented Dominant is:

1 2 3 #4 #5 6 b7

The important color tones are:

#4 = Lydian brightness
#5 = augmented tension
b7 = dominant sound

This combination creates a mode that feels bright, unstable, and unresolved in a very musical way.

Notice that there is no natural 5th.

Instead of G, you get G#, which gives the mode its augmented flavor.

Notes in C

The notes of C Lydian Augmented Dominant are:

C D E F# G# A Bb

The Chord That Defines the Mode

Defining chords of C Lydian Augmented Dominant:

C7#5

You can also use the simpler augmented triad:

C+

The core chord tones of C7#5 are:

C E G# Bb

That gives you:

C = root
E = major 3rd
G# = augmented 5th / #5
Bb = minor 7th / b7

This four-note chord captures the dominant and augmented qualities of the mode.

Other useful chords from the mode include:

C+ = C E G#
C7#5 = C E G# Bb

You do not always need every modal color at once. If the chord gives you C, E, G#, and Bb, the augmented dominant sound is clear. Add F# in the melody or between chord hits to emphasize the Lydian quality.

Chord Progression (Example)

Because this mode is advanced and unstable, it often works best in vamps rather than traditional functional progressions.

The goal is to keep C feeling like home while using chords that highlight the mode’s special notes.

Roman numerals:

I7#5 – II7 – I7#5

In C:

C7#5 – D7 – C7#5

This is a strong fusion-style vamp.

The C7#5 gives you the augmented dominant identity, while D7 brings out the notes D, F#, A, and C.

Those notes are all inside the mode.

Mood:

Bright
Tense
Jazzy
Great for legato fusion soloing

Try playing a C drone underneath this progression to keep the harmony centered on C.

Guitar Fretboard Shape

Here’s the mode mapped across the full fretboard, generated with my software SLModes.

The diagram shows every occurrence of the mode across the neck:

🟢 Green dots = the root note, your anchor points
🟠 Orange dots = the rest of the scale tones

Why Guitarists Love This Mode

C Lydian Augmented Dominant has a rare emotional mix.

It is bright, but not happy.

It is dominant, but not bluesy in the usual way.

It is tense, but not fully dark.

That makes it perfect when you want something that feels:

Futuristic
Sophisticated
Unstable
Powerful
Harmonically rich

The #4 gives it lift.

The #5 gives it danger.

The b7 gives it motion.

Together, those tones create a mode that wants to move, bend, and transform.

Genres Where It Works Well

C Lydian Augmented Dominant fits naturally in:

Jazz fusion
Progressive rock
Progressive metal
Modern jazz guitar
Film/game music
Experimental songwriting
Instrumental guitar music
Math rock harmony
Advanced funk/fusion vamps

It is not usually a “campfire chord progression” mode.

It is a color mode for players who want tension, sophistication, and surprise.

Tips for Practicing

To practice a mode effectively, you only need two things:

An instrument to play the mode (your guitar is ready to go!)
A backing track that provides a harmonic context

The fretboard diagram above already show you where the notes are. The remaining piece is choosing an appropriate backing track to improvise over.

Practice with a drone

The simplest option is a single C drone.

You can create one using:

A looper pedal
A synth drone
A sustained bass note in your DAW
An open C tuning
Or any other source of a continuous C note

Because the accompaniment consists of only a single note, you are responsible for highlighting the intervals that define the mode. The more intentionally you emphasize its characteristic tones, the more clearly the modal sound will emerge.

Create modal vamps with SLModes

While a drone is an excellent way to hear a mode in isolation, a modal vamp often provides a more musical and rewarding practice experience.

A well-designed backing track naturally emphasizes the mode’s characteristic intervals, allowing you to focus on phrasing, melody, and expression instead of constantly trying to establish the modal sound yourself. As a result, improvising in the character of the mode often feels more intuitive.

There are many ways to build modal backing tracks, but SLModes can generate them for you in just a few clicks. For example:

Arpeggiated backing tracks — a repeating pattern that outlines every note of the mode.
Chord vamps — progressions built from chords that best reinforce the mode’s unique character.

This video shows you an example: