The root left to the bass player. Frees a finger for a tension.
Faug9 is F, A, C#, Eb and G — F7 with the fifth raised and the natural ninth added on top.
It sounds bright, tense and slightly unreal. Raising the fifth leaves no semitone in the lower half of the chord, which is where the whole-tone flavour comes from.

| F | A | C# | Eb | G |
|---|---|---|---|---|
| 1 | 3 | ♯5 | ♭7 | 9 |
Altered dominant — dominant pull with a whole-tone colour.
Also written F9#5, F+9 or F9(#5). The same chord either way; which spelling you meet depends on who wrote the chart.
Leave the root to the bass player. In a band nobody misses it, and the ear supplies it from the guide tones anyway.
The finger it frees goes to a tension, which is why these sound richer than the shape they came from rather than thinner.
Faug9 has 14 of them, on the top four strings, the middle four strings and strings 5-3-2-1, from open position up to the 13th — every inversion the chord has: A in the bass, C# in the bass, Eb in the bass and G in the bass. The one to learn first is the Eb shape at the nut, which is the easiest grip here.
5 of them sit on the top four strings, so you can run the inversions up one set without changing strings — which is the whole reason to learn them as a family rather than as separate grips.
Start with xx1223 — no barre and down at the nut. 1 of the 7 shapes here sits in open position. 4 of the 7 need a barre. Together they cover the neck from the 1st fret to the 14th.
| Frets | Where | Bass | Top | Hand |
|---|---|---|---|---|
| 101021 | open position | F, root position | F | barred |
| 1x1223 | 1st fret | F, root position | G | all fretted |
| xx1223 | 1st fret | Eb, 3rd inversion | G | all fretted |
| 565665 | 5th fret | A, 1st inversion | A | barred |
| x87889 | 7th fret | F, root position | C# | barred |
| 11-10-11-10-10-11 | 10th fret | Eb, 3rd inversion | Eb | barred |
| 13-12-13-12-14-x | 12th fret | F, root position | C# | all fretted |
The same notes rebuilt from scratch give 8 shell voicings, each on its own page.
Tensions. A shell of Faug9, root, third and seventh, leaves a string free, and the tones that belong over it are the #11 (B).
Faug9 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, Faug9 → Bb. 3 voices move by a semitone, and one note is common to both chords.
| In Faug9 | Moves | In Bb |
|---|---|---|
| F, the root | stays where it is | F, the fifth |
| A, the major third | rises a semitone | Bb, the root |
| C#, the sharp fifth | rises a semitone | D, the major third |
| Eb, the flat seventh | falls a semitone | D, the major third |
| G, the ninth | falls a whole tone | F, the fifth |
Every note of Faug9 is in F whole tone.
Change one note of Faug9 and you have Falt (the ninth becomes a flat ninth), Faug7 (drop the ninth), F9 (the sharp fifth becomes a fifth) or F9b5 (the sharp fifth becomes a flat fifth).
Faug9 is an altered chord — a dominant seventh with its fifth or ninth moved. Altered dominant chords on every root.
On Faug9’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.
Shows each chord the way this style would voice it, and marks which of its alternatives belong to the idiom.