Aaug7 guitar chord
The third voice from the top lowered an octave. The dropped voice becomes the bass, which is why a string is skipped.
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About Aaug7 — drop 3 voicings
Aaug7 is A, C#, E# and G — A7 with the fifth raised a semitone.
It sounds strained and chromatic. The raised fifth is heard as a ♭13 sitting a semitone above where it is going, so the chord pushes harder than a plain dominant.
Aaug7 notes and formula
| A | C# | E# | G |
|---|---|---|---|
| 1 | 3 | ♯5 | ♭7 |
Altered dominant — the pull of a 7, sharpened.
Also written A7#5, A+7 or A7(#5). The same chord either way; which spelling you meet depends on who wrote the chart.
How to play Aaug7
The same operation one voice further down: the third voice from the top falls an octave and becomes the bass.
That leaves a bigger hole under the top three notes, so a string gets skipped: the muted string in the middle is the shape, not a mistake.
Aaug7 has 10 of them, on strings 5-3-2-1 and strings 6-4-3-2, from open position up to the 14th — every inversion the chord has: A in the bass, C# in the bass, E# in the bass and G in the bass. The one to learn first is the A shape at the nut.
5 of them sit on strings 5-3-2-1, 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 x03021 — 2 open strings and only 3 fretted notes. 2 of the 8 shapes here sit in open position. None of them needs a barre. Together they cover the neck from the 1st fret to the 15th.
| Frets | Where | Bass | Top | Hand |
|---|---|---|---|---|
| x03021 | open position | A, root position | E# | 2 open strings |
| x03223 | open position | A, root position | G | 1 open string |
| x05665 | 5th fret | A, root position | A | 1 open string |
| 545x6x | 4th fret | A, root position | E# | all fretted |
| 5x566x | 5th fret | A, root position | E# | all fretted |
| x-x-7-10-8-9 | 7th fret | A, root position | C# | all fretted |
| x-12-11-12-x-13 | 11th fret | A, root position | E# | all fretted |
| x-12-15-12-14-13 | 12th fret | A, root position | E# | all fretted |
The same notes rebuilt from scratch give 4 shell, 14 drop 2 and 3 open string voicings, each on its own page.
Tensions. A shell of Aaug7, root, third and seventh, leaves a string free, and the tones that belong over it are the b9 (Bb), the 9 (B), the #9 (B#) and the #11 (D#).
How to use Aaug7
Aaug7 is a dominant with its tension raised, so it still points at D — harder than a plain seventh does, because the altered tones sit a semitone from where they are going.
Voice by voice, Aaug7 → D. 3 voices move by a semitone, and one note is common to both chords.
| In Aaug7 | Moves | In D |
|---|---|---|
| A, the root | stays where it is | A, the fifth |
| C#, the major third | rises a semitone | D, the root |
| E#, the sharp fifth | rises a semitone | F#, the major third |
| G, the flat seventh | falls a semitone | F#, the major third |
What to play over Aaug7
Every note of Aaug7 is in A whole tone and A altered.
Chords near Aaug7
Change one note of Aaug7 and you have Amaj7#5 (the flat seventh becomes a major seventh), A7 (the sharp fifth becomes a fifth), A7b5 (the sharp fifth becomes a flat fifth), Aalt (add the flat ninth), Aaug (drop the flat seventh) or Aaug9 (add the ninth).
Aaug7 is an altered chord — a dominant seventh with its fifth or ninth moved. Altered dominant chords on every root.
On Aaug7’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.