A7#9 Guitar Chord
A7#9 is a dominant seventh sharp nine (7#9) chord. It is a dominant seventh with a sharp ninth on top. The sharp ninth rubs against the major third for the gritty sound heard in rock and funk. Its notes are A, C#, E, G and B# (= C). Below is one way to play it, with a chord diagram, tab and finger numbers.
Notes in A7#9
| Note | Degree | Interval |
|---|---|---|
| A | R | Root |
| C# | 3 | Major 3rd |
| E | 5 | Perfect 5th |
| G | b7 | Minor 7th |
| B# (= C) | #9 | Augmented 9th |
Formula: 1–3–5–b7–#9
B# is the correct spelling of this note in this chord. On the guitar it is the same pitch as C.
A7#9 chord shapes
Finger numbers: 1 index, 2 middle, 3 ring, 4 pinky. In the tab, x means don't play that string and 0 means play it open. In the diagrams the top line is the 1st (thinnest) string and the nut is on the left.
E-shape 5fr
Easiest- Tab (6th → 1st string)
- 5 7 5 6 5 8
- Fingers
- 1 3 1 2 1 4
How to play A7#9 (easiest shape)
Shape: E-shape 5fr, tab 5 7 5 6 5 8 (6th to 1st string).
- 1Lay your index finger (1) flat across the 6th to 2nd strings at the 5th fret (a barre).
- 2Put your middle finger (2) on the 3rd string at the 6th fret.
- 3Put your ring finger (3) on the 5th string at the 7th fret.
- 4Put your pinky (4) on the 1st string at the 8th fret.
- 5Strum down from the 6th string to the 1st string.
A7#9: common questions
- What notes are in the A7#9 chord?
- A7#9 has 5 notes: A, C#, E, G and B# (= C). Counted from the root, that is 1–3–5–b7–#9.
- Is there an easier way to play A7#9?
- The easiest shape on this page is "E-shape 5fr" (5 7 5 6 5 8). Every shape on this page is a barre chord. Barre shapes are movable: keep the same hand shape and slide it along the neck to play this type of chord from other roots.
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