Fm7b5 guitar chord
Root, third and seventh: the guide tones fix the quality, so the fifth is dropped. That is what leaves a string free, so pick a tension to put on top.
- Tap a note to hear it
- Arrows change position
- Fingers, notes or intervals
- Play the chord
About Fm7b5 — shell voicings
Fm7b5 is F, Ab, Cb and Eb — Fm7 with the fifth lowered a semitone.
It sounds hollow, and unmistakably going somewhere. Almost always the first chord of a minor ii–V–i, so it walks straight into an altered dominant.
Fm7b5 notes and formula
| F | Ab | Cb | Eb |
|---|---|---|---|
| 1 | ♭3 | ♭5 | ♭7 |
Pre-dominant — the ii of a minor key.
Also written Fø, Fø7, Fm7-5, Fm7(b5) or F half diminished. The same chord either way; which spelling you meet depends on who wrote the chart.
How to play Fm7b5
Root, third and seventh. The third and seventh, the guide tones, are what make the chord major, minor or dominant, so the fifth can go: it says nothing the symbol needs.
Three notes means a spare string, which is the real point. Put a tension on it.
Fm7b5 has 5 of them, on strings 6-4-3-2, strings 5-3-2-1, the bottom four strings and the middle four strings, from open position up to the 12th — all in one inversion, so the bass note never moves. The one to learn first is the F shape at the nut.
Start with x8989x — no barre. 1 of the 9 shapes here sits in open position. 5 of the 9 need a barre. Together they cover the neck from the 1st fret to the 13th.
| Frets | Where | Bass | Top | Hand |
|---|---|---|---|---|
| 1x110x | open position | F, root position | Cb | barred |
| 123141 | 1st fret | F, root position | F | barred |
| xx3444 | 3rd fret | F, root position | Ab | barred |
| x86867 | 6th fret | F, root position | Cb | all fretted |
| x8989x | 8th fret | F, root position | Ab | all fretted |
| x-x-9-10-9-11 | 9th fret | Cb, 2nd inversion | Eb | all fretted |
| 13-11-13-13-0-x | 11th fret | F, root position | Ab | barred |
| 13-x-x-13-12-11 | 11th fret | F, root position | Eb | all fretted |
| 13-x-13-13-12-x | 12th fret | F, root position | Cb | barred |
The same notes rebuilt from scratch give 14 drop 2 and 9 drop 3 voicings, each on its own page.
Tensions. A shell of Fm7b5, root, third and seventh, leaves a string free, and the tones that belong over it are the 11 (Bb) and the b13 (Db).
How to use Fm7b5
Fm7b5 is the ii of Eb minor, which is where it is nearly always found: half-diminished, then an altered dominant, then the minor tonic.
In which keys. Every note of Fm7b5 belongs to Eb minor (the ii°, the supertonic) and F# major (the vii°, the leading tone).
What to play over Fm7b5
Every note of Fm7b5 is in F blues, F locrian, F altered and F half-whole diminished.
Chords near Fm7b5
Change one note of Fm7b5 and you have Fdim (drop the flat seventh), Fdim7 (the flat seventh becomes a sixth), Fm7 (the flat fifth becomes a fifth), FmMaj7b5 (the flat seventh becomes a major seventh) or F7b5 (the minor third becomes a major third).
Fm7b5 is a diminished chord — root, minor third, flat fifth. Diminished and half-diminished chords on every root.
On Fm7b5’s sound and use this page follows Mark Levine, The Jazz Theory Book (Sher Music, 1995). The shapes and the derived voicings come from different places, and both are explained in where the chords and the theory come from.