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A♭ 7th chord on bass (A♭7)
Also called or written A♭7, A♭, A♭ Dominant 7th or A♭ Major Minor 7th
A♭ 7th is built from A♭, C, E♭ and G♭. This four-note dominant shape stretches the fretting hand across four frets, so it suits players who already own their bass neck.
How it is built
Formula 1, 3, 5, ♭7
- Root positionA♭–C–E♭–G♭A♭74-6-4-5
- First inversionC–E♭–G♭–A♭A♭7/Cno shape on this instrument
- Second inversionE♭–G♭–A♭–CA♭7/E♭11-11-10-11
- Third inversionG♭–A♭–C–E♭A♭7/G♭2-3-1-1
How do you play an A♭ 7th chord on bass?
A♭ 7th is played at the 4th fret as 4 6 4 5: index finger on the E string at fret 4, pinky finger on the A string at fret 6, middle finger on the D string at fret 4 and ring finger on the G string at fret 5.
Full note and interval breakdown
| String | Fret | Finger | Note |
|---|---|---|---|
| 4 (E) | 4 | 1 | A♭ (1) |
| 3 (A) | 6 | 4 | E♭ (5) |
| 2 (D) | 4 | 2 | G♭ (♭7) |
| 1 (G) | 5 | 3 | C (3) |
AdvancedThe pinky must reach the 6th fret on the A string while the index and middle hold the 4th fret, stretching the hand across four frets.
A♭7/E♭ inversion
A♭ 7th is played at the 10th fret as 11 11 10 11: middle finger on the E string at fret 11, ring finger on the A string at fret 11, index finger on the D string at fret 10 and pinky finger on the G string at fret 11.
Full note and interval breakdown
| String | Fret | Finger | Note |
|---|---|---|---|
| 4 (E) | 11 | 2 | E♭ (5) |
| 3 (A) | 11 | 3 | A♭ (1) |
| 2 (D) | 10 | 1 | C (3) |
| 1 (G) | 11 | 4 | G♭ (♭7) |
A♭7/G♭ inversion · fret 1
A♭ 7th is played at the 1st fret as 2 3 1 1: ring finger on the E string at fret 2, pinky finger on the A string at fret 3, index finger on the D string at fret 1 and middle finger on the G string at fret 1.
Full note and interval breakdown
| String | Fret | Finger | Note |
|---|---|---|---|
| 4 (E) | 2 | 3 | G♭ (♭7) |
| 3 (A) | 3 | 4 | C (3) |
| 2 (D) | 1 | 1 | E♭ (5) |
| 1 (G) | 1 | 2 | A♭ (1) |
A♭7/G♭ inversion · fret 13
A♭ 7th is played at the 13th fret as 14 15 13 13: ring finger on the E string at fret 14, pinky finger on the A string at fret 15, index finger on the D string at fret 13 and middle finger on the G string at fret 13.
Full note and interval breakdown
| String | Fret | Finger | Note |
|---|---|---|---|
| 4 (E) | 14 | 3 | G♭ (♭7) |
| 3 (A) | 15 | 4 | C (3) |
| 2 (D) | 13 | 1 | E♭ (5) |
| 1 (G) | 13 | 2 | A♭ (1) |
Why it sounds like that
A♭ 7th uses the dominant formula 1, 3, 5, ♭7. The minor 7th interval from A♭ to G♭ gives the chord its dominant pull, and the diminished 5th between C and G♭ adds tension. Compare it with A♭ major, which drops the G♭ for a plain major triad.
What goes wrong with A♭ 7th?
- Letting the pinky flatten and buzz the A string instead of fretting C cleanly.
- Allowing the ring finger to touch the D string, which mutes the E♭.
- Rushing the shift into this shape and landing with the index finger off the 4th fret.
When to use it
A♭ 7th works as the V chord in C♯ major, resolving to C♯ major. Try it in a I–V–vi–IV progression: C♯ major–A♭ 7th–A♯ minor–F♯ major. Its dominant tension suits blues, funk and rock bass lines.
Changing to and from A♭ 7th
- From A♭ 7th, slide the whole shape down one fret to the 3rd fret to reach G 7th; keep the same finger spacing.
- Move to A♭ major by lifting the ring finger off the G string and leaving the other three fingers in place.
Which voicing to use
The 4th fret shape puts A♭ in the bass and is the most direct voicing. The A♭7/E♭ inversion at the 11th fret starts on E♭, which softens the root movement and works well when the band already has the root covered.
Other A♭ chords
Common questions
How is A♭ 7th written?
A♭ 7th is written as A♭7 or simply A♭ in lead sheets. On a keyboard or text, use the ASCII spelling Ab7. The chord is also called Dominant 7th or Major Minor 7th. It is also spelled G♯ in enharmonic notation for the same sounding root.
What is the difference between A♭ 7th and A♭ major?
A♭ major contains A♭, C and E♭. A♭ 7th adds G♭, the minor 7th, which creates a dominant sound that pulls toward D♭ or C♯.
Why does A♭ 7th sound tense?
The diminished 5th between C and G♭ is a tritone. That interval wants to resolve, which is why dominant 7th chords lead so strongly to their tonic.
Can A♭ 7th be played in a higher register?
Yes, the A♭7/G♭ inversion at the 2nd fret puts G♭ in the bass. The same inversion at the 14th fret sounds brighter and works well for fills in the upper register.