F#maj7b5

Q: What notes are in the F#maj7b5 chord?

The F#maj7b5 chord (F# Major 7b5) contains: F#, A#, C, E#. Its interval structure is shown above in the Theory section.

Q: How do I build F#maj7b5 on the keyboard?

Take the root and add the remaining chord tones following the interval formula. The highlight shows chord content, while the inversion control changes which chord tone is in the bass.

Q: Which keys is F#maj7b5 found in?

The chord acts as a diatonic degree in several keys — they are marked on the circle of fifths in the "Harmonic context" block.

Q: What can I substitute for F#maj7b5?

A substitution depends on harmonic function and voice leading, not only on shared tones. Computed options appear in the "Substitutions" block and should be checked in context.

F# Major 7b5

Octaves

Musical context

ChordF# majorTriad

ChordF#maj7b5F# Major 7b5

ArpeggioF# majorBroken triad

ScaleF# major7 notes

KeyF# majorMajor key

ProgressionPop axisSequence

How the chord relates to the scale, mode, key and progression.

Theory

General info

Full name: F# Major 7b5
Symbol: F#maj7b5
Root: F#
Quality: Major 7b5

Chord notes

1F#root

3A#major 3rd

b5Cdim 5th

7E#major 7th

Functions & resolutions

Typical function in key: IVSubdominant (IV)C# major
Stability / tension: Stable — can serve as major tonic
Most common resolutions: BB Major C#C# Major D#mD# Minor
Unstable degrees: 4B
b5C
resolves inward to the 4th
7F
1F#
resolves up to the root
Main resolution: F#maj7b5source
C#C# Major
Major chord F# is a stable tonic. As tonic it doesn't require resolution, but in a progression context typically moves to IV or V.
Other resolutions: F#maj7b5source
Deceptive resolution
D#mD# Minor
As the V degree, a major chord can defy expectations by moving to vi instead of I (deceptive cadence).
F#maj7b5source
Modal resolution
EE Major
In modal context, a major chord can freely move to bVII, bIII, or bVI — characteristic of Mixolydian mode.
F#maj7b5source
Jazz reharmonization
F#maj7F# Major 7
In jazz, a major chord is enriched to maj7, 6/9, or add9 and can smoothly transition into a ii-V of another key (modulation).
F#maj7b5source
Functional resolution
C#C# Major
As the IV degree (subdominant), a major chord can resolve to V or directly to I (plagal cadence).

Features

Character: Major, with major 7th and diminished 5th
Characteristic interval: Diminished 5th (b5), Major 7th (M7)
Description: The major 3rd preserves major quality, while the diminished 5th and major 7th create two directed dissonances.
Application: Lydian mode
Contemporary jazz
Experimental harmony

Voicing & structure

Root position

v1F#(F#4)Bass

root

v2A#(A#4)M3from F#

v3C(C5)M2from A#

v4E#(E#5)P4from C

Harmony

Compatible scales

All chord tones are contained in these scales — use them for improvisation.

ScaleC Iwato (Japanese)ScaleF In (Japanese)ScaleF# Chinese scale ScaleA# Hirajoshi (Japanese)ScaleD# Akebono (Japanese)ScaleC Blues scale ScaleC Locrian ScaleF Phrygian ScaleF Double harmonic ScaleF Neapolitan minor

This chord on guitar 🎸

See how F#maj7b5 looks on guitar.

Explore

Circle of fifths

Highlighted major keys contain this chord among their diatonic harmonies.

Relative key: D#mD# minor
Dominant: DbDb major
Subdominant: BB major
Key signature: 6 sharps (F#, C#, G#, D#, A#, E#)

What to learn next

ScaleF# LydianScale to improvise over this chord PracticeChord trainerLock the fingering into muscle memory ProgressionChord progressionsHow this chord works inside real progressions

Recommended for you

F# LydianA scale related to this chord

F# Chromatic scaleA scale related to this chord

F# Persian scaleA scale related to this chord

F# Enigmatic scaleA scale related to this chord

F# Chinese scaleA scale related to this chord

Practice

Keyboard Trainer

Reinforce it in practice — play and name notes on the interactive keyboard.

Open Trainer

Test yourself

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What notes are in the F#maj7b5 chord?

How do I build F#maj7b5 on the keyboard?

Which keys is F#maj7b5 found in?

What can I substitute for F#maj7b5?