Lydian #6 Mode on Guitar: Notes, Chords & Examples

Lydian ♯6 is a bright, futuristic, and slightly unstable mode. It has the floating “open sky” sound of regular Lydian, but with an extra twist: the raised 6th.

That ♯6 gives the mode a strange, synthetic tension. On guitar, it can sound:

Dreamy and cinematic
Progressive and angular
Fusion-like and harmonically rich
Slightly alien or “outside”
Bright, but not traditionally happy

If Lydian sounds like a major scale floating upward, Lydian ♯6 sounds like that same brightness pushed into more exotic, progressive territory.

This is not one of the everyday rock modes like Dorian, Mixolydian, or Phrygian. It is more of a color mode for players who want unusual melodic tension over major-type chords.

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 ♯6 is:

1 2 3 #4 5 ♯6 7

Compared to the C major scale:

C major: C D E F G A B

C Lydian ♯6: C D E F# G A# B

So the changed notes are:

#4 = F#
♯6 = A#

The #4 gives the mode its Lydian sound.

The ♯6 is what makes it more unusual and synthetic.

Notes in C

The notes of C Lydian ♯6 are:

C D E F# G A# B

Important spelling note: The raised 6th is written as A#, not Bb.

On guitar, A# and Bb are the same fret in standard tuning, but the theory meaning is different. In this mode, A# functions as a raised 6th, not as a flat 7th.

That matters because the mode also contains B, the major 7th. The A# and B sit right next to each other, creating one of the most distinctive tensions in the scale.

The Chord That Defines the Mode

The defining chord of C Lydian ♯6 is:

Cmaj7#11(add♯6)

The chord tones are:

C E G B F# A#

You do not always need to play every note at once. In fact, the full chord can be very tense because A# and B are only a half-step apart.

The core sound comes from:

C E G B = Cmaj7
F# = #11, the classic Lydian color
A# = ♯6, the special color of Lydian ♯6

A practical guitar voicing could be:

Cmaj7#11(add♯6, no5)

e|--2--  F#
B|--0--  B
G|--3--  A#
D|--2--  E
A|--3--  C
E|-----

This voicing is tense, colorful, and very modern. Use it when you want the listener to clearly hear that this is not ordinary C major or regular C Lydian.

For a smoother sound, you can use Cmaj7#11 as the main chord and bring in the A# melodically.

Chord Progression (Example)

Because C Lydian ♯6 is an advanced synthetic mode, chord progressions work best when they keep C as the tonal center. Avoid progressions that pull too strongly into traditional major or minor key harmony.

Think in terms of vamps, pedal tones, and color chords.

Roman numerals:

Imaj7#11(add♯6) – II7#5 – Imaj7#11

In C:

Cmaj7#11(add A#) – D7#5 – Cmaj7#11

The D7#5 chord comes directly from the mode:

D F# A# C

This chord strongly highlights both the #4 and ♯6 of C Lydian ♯6.

Mood: Bright, suspended, and slightly unstable. Great for fusion intros, progressive clean sections, or cinematic guitar layers.

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 ♯6 has a rare emotional balance.

It is major, but not simple.

It is bright, but not innocent.

It feels open and elevated because of the #4, but the ♯6 adds tension that makes the sound more complex and unpredictable.

This makes it useful when regular major or Lydian feels too familiar.

Genres Where It Works Well

C Lydian ♯6 can work in:

Progressive rock
Progressive metal
Jazz fusion
Modern instrumental guitar music
Cinematic scoring
Ambient guitar music
Experimental songwriting
Game soundtrack-style composition

It is especially useful when you want a major tonal center with a futuristic edge.

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: