Fm7b5

General info

Full name

F Half-dim 7

Symbol

Fm7b5

Root

F

Quality

Half-dim 7

Chord notes

Functions & resolutions

Typical function in key

iiiMediant (iii)C# major

Stability / tension

High tension — pulls toward the dominant

Most common resolutions

Bb7Bb Dominant 7EbmEb Minor

Unstable degrees

2G

b3Ab

resolves down to the 2nd

4Bb

b5B

resolves inward to the 4th

4Bb

b7Eb

resolves down to the resolution tonic

Main resolution

Fm7b5source

Bb7Bb Dominant 7

Half-diminished Fm7b5 typically acts as ii in minor, resolving to the dominant (Bb7), which then leads to the tonic.

Other resolutions

Fm7b5source

Deceptive resolution

EbmEb Minor

The half-diminished chord can bypass the dominant and resolve directly to the minor tonic — a plagal turn in minor.

Fm7b5source

No resolution needed

In the Locrian mode, a half-diminished chord can function as the tonic, requiring no resolution.

Fm7b5source

Jazz reharmonization

Abm6Ab Minor 6

In jazz, ø7 is common in ii-V-i progressions but can be substituted with iv6, sharing the same notes.

Fm7b5source

Functional resolution

DbDb Major

Besides moving to the dominant, the half-diminished chord can resolve to bVI — creating a Phrygian color.

Features

Character

Half-diminished, unstable

Characteristic interval

Diminished 5th (b5)

Description

The diminished fifth creates instability, the minor seventh softens it. Less tense than fully diminished.

Application

• iiø7 in natural minor
• Jazz ii–V in minor
• Unstable predominant sonorities

Voicing & structure

Harmony

Harmonic context

iim7b5Eb minorPredominantvim7b5Ab DorianTonic

Compatible scales

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