F7b5 guitar chord
An open string left ringing against a fretted grip. Because it costs no finger, it sounds a note the closed shape has none left for -- a tension on top, or a pedal root underneath. Either a familiar grip with open strings added, or a shape so sparse the open strings carry the chord. These belong to their key rather than to a shape, so D, A, G and E have many and Eb a handful.
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- Fingers, notes or intervals
- Play the chord
About F7b5 — open string voicings
F7b5 is F, A, Cb and Eb — F7 with the fifth lowered a semitone.
It sounds symmetrical and slightly unreal. The same four notes spell a 7♭5 a tritone away, which is exactly why one can stand in for the other.
F7b5 notes and formula
| F | A | Cb | Eb |
|---|---|---|---|
| 1 | 3 | ♭5 | ♭7 |
Altered dominant — and the chord that makes the tritone substitution work.
Also written F7(b5), F7-5 or F7♭5. The same chord either way; which spelling you meet depends on who wrote the chart.
How to play F7b5
An open string left ringing against a fretted grip. It costs no finger, so it can sound a note the closed shape has none left for: a tension on top, or a pedal root underneath.
These belong to their key rather than to a shape: they cannot be moved up the neck. D, A, G and E have many; E♭ has a handful.
F7b5 has 2 of them, on strings 6-5-4-3-2 and the middle four strings, from the 5th fret up to the 6th — every inversion the chord has: A in the bass and Eb in the bass. The one to learn first is the A shape at the 5th fret, which is the easiest grip here.
Start with xx3445 — no barre and low, at the 3rd fret. 1 of the 6 shapes here sits in open position. 1 of the 6 needs a barre. Together they cover the neck from the 1st fret to the 14th.
| Frets | Where | Bass | Top | Hand |
|---|---|---|---|---|
| 101201 | open position | F, root position | F | barred |
| xx3445 | 3rd fret | F, root position | A | all fretted |
| x67867 | 6th fret | Eb, 3rd inversion | Cb | all fretted |
| xx7867 | 6th fret | A, 1st inversion | Cb | all fretted |
| x-8-9-8-10-x | 8th fret | F, root position | A | all fretted |
| 13-x-13-14-12-x | 12th fret | F, root position | Cb | all fretted |
The same notes rebuilt from scratch give 6 shell, 14 drop 2 and 9 drop 3 voicings, each on its own page.
Tensions. A shell of F7b5, root, third and seventh, leaves a string free, and the tones that belong over it are the b9 (Gb), the 9 (G), the #9 (G#), the b13 (Db) and the 13 (D).
How to use F7b5
F7b5 is a dominant with its tension raised, so it still points at Bb — harder than a plain seventh does, because the altered tones sit a semitone from where they are going.
Voice by voice, F7b5 → Bb. 3 voices move by a semitone, and one note is common to both chords.
| In F7b5 | Moves | In Bb |
|---|---|---|
| F, the root | stays where it is | F, the fifth |
| A, the major third | rises a semitone | Bb, the root |
| Cb, the flat fifth | falls a semitone | Bb, the root |
| Eb, the flat seventh | falls a semitone | D, the major third |
What to play over F7b5
Every note of F7b5 is in F whole tone, F lydian dominant, F altered and F half-whole diminished.
Chords near F7b5
Change one note of F7b5 and you have Fmaj7b5 (the flat seventh becomes a major seventh), Fm7b5 (the major third becomes a minor third), F7 (the flat fifth becomes a fifth), Faug7 (the flat fifth becomes a sharp fifth), F9b5 (add the ninth) or F/D# (the flat fifth becomes a fifth).
F7b5 is an altered chord — a dominant seventh with its fifth or ninth moved. Altered dominant chords on every root.
On F7b5’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.