Lydian Augmented #2 Mode on Guitar: Notes, Chords & Examples

The Lydian Augmented ♯2 mode is a bright, strange, futuristic major mode with a sharp edge.

It has the floating quality of Lydian, the dreamy instability of an augmented 5th, and the spicy bite of a raised 2nd. On guitar, it sounds modern, cinematic, and slightly alien — perfect for progressive rock, fusion, metal interludes, and experimental songwriting.

If regular Lydian sounds like “wide open sky,” Lydian Augmented ♯2 sounds more like a glowing sci-fi skyline.

It is not a common everyday rock mode, but that is exactly what makes it useful. If you want a major sound that does not feel predictable, this mode gives you plenty of color.

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 Lydian Augmented ♯2 is:

1 ♯2 3 #4 #5 6 7

Compared to the major scale:

The 2nd is raised: D becomes D#
The 4th is raised: F becomes F#
The 5th is raised: G becomes G#

So it keeps the major 3rd and major 7th, but adds three sharp colors.

That gives the mode a very bright, tense, and harmonically unstable sound.

Notes in C

The notes of C Lydian Augmented ♯2 are:

C D# E F# G# A B

Scale degrees:

Degree	Note
1	C
♯2	D#
3	E
#4	F#
#5	G#
6	A
7	B

The note D# is important. Even though it is enharmonically the same pitch as Eb, we call it D# here because it functions as a raised 2nd, not a minor 3rd.

That distinction matters because the scale also contains E, the major 3rd.

So you get this tense chromatic relationship:

D# to E

That half-step is one of the defining sounds of the mode.

The Chord That Defines the Mode

The defining chord of C Lydian Augmented ♯2 is:

Cmaj7#5(#9#11)

Basic chord tones:

C E G# B

That gives you:

C = root
E = major 3rd
G# = augmented 5th
B = major 7th

This is already a strong modal chord: Cmaj7#5.

To bring out the full mode, add:

D# as the #9
F# as the #11
A as the 13

So the full color is:

C E G# B D# F# A

That is a big, colorful sound. On guitar, you usually do not need to play every note at once. Even a smaller voicing like this can suggest the mode:

Cmaj7#5(#11)

e|--0--
B|--0--
G|--1--
D|--2--
A|--3--
E|-----

Notes: C E G# B F#

The essential ingredients are:

Major 3rd for the bright major quality
#5 for the augmented, floating sound
#11 for the Lydian lift
#9 for the unusual bite

If you want the mode to sound distinct from regular Lydian Augmented, make sure you feature the D#.

Chord Progression (Example)

Because this is an advanced synthetic mode, chord progressions can easily pull away from C. To keep the sound centered, use C pedal tones, repeat the tonic chord often, or write riffs that clearly return to C.

Roman numerals:

Imaj7#5 – IIImaj7 – #ivm7b5 – Imaj7#5

Chords in C:

Cmaj7#5 – Emaj7 – F#m7b5 – Cmaj7#5

This progression sounds bright, glassy, and progressive.

The Emaj7 chord brings out the notes E G# B D#, which strongly highlights the major 3rd, augmented 5th, major 7th, and raised 2nd of C.

The F#m7b5 chord adds tension without sounding traditionally “dark.” It shares important color tones with C Lydian Augmented ♯2, especially F#, A, C, and E.

Use this for fusion intros, clean prog sections, or atmospheric songwriting.

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 ♯2 sounds bright, tense, and otherworldly.

It is major, but not comfortable in a traditional way. The raised 2nd and raised 5th make it feel unstable and futuristic.

This makes it great for:

Sci-fi moods
Dreamlike tension
Progressive harmony
Floating major chords with a dangerous edge

Genres Where It Works Well

C Lydian Augmented ♯2 fits naturally in:

Progressive rock
Progressive metal
Jazz fusion
Instrumental guitar music
Cinematic scoring
Experimental songwriting
Ambient and post-rock sections

It is less common in blues, classic rock, country, or straightforward pop unless used briefly as a color.

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: