Abm13 — Ab minor thirteenth chord
A minor seventh chord with the ninth and the thirteenth added. The eleventh is normally left out, as on the dominant thirteenth.
- 1 = Ab
- b3 = Cb
- 5 = Eb
- b7 = Gb
- 9 = Bb
- 13 = F
- Symbol
- Abm13
- Root
- Ab
- Quality
- Minor thirteenth
- Family
- extended
- Notes
- Ab Cb Eb Gb Bb F
- Degree formula
1 b3 5 b7 9 13- Semitones from the root
0 2 3 7 9 10- Distinct pitch classes
- 6
- Interval structure
- Stacked from the root: 3 semitones, 4 semitones, 3 semitones, 4 semitones, 7 semitones
- Notation
- Written m13. A tonic or subdominant colour in jazz and soul.
- Key
- Ab · Ab major / F minor key signature
Fingering charts
The library holds 5 fingerings of this chord and all of them are shown, in the library’s own order. Several fingerings of one chord is normal: the same notes can be stopped at different positions and on different strings.
Formula
The chord tones in order from the root, with the interval each one forms above it.
| Degree | Note | Semitones | Interval from the root |
|---|---|---|---|
| 1 | Ab | 0 | Perfect unison |
| b3 | Cb | 3 | Minor third |
| 5 | Eb | 7 | Perfect fifth |
| b7 | Gb | 10 | Minor seventh |
| 9 | Bb | 2 | Major second |
| 13 | F | 9 | Major sixth |
Inversions
An inversion is the same set of notes with a different one in the bass. The last column gives the distance of each note above the bass note, in semitones.
| Inversion | Bass note | Degree in the bass | Notes above the bass | Semitones above the bass |
|---|---|---|---|---|
| root position | Ab | 1 | Ab – Cb – Eb – Gb – Bb – F | 0 3 7 10 2 9 |
| first inversion | Cb | b3 | Cb – Eb – Gb – Bb – F – Ab | 0 4 7 11 6 9 |
| second inversion | Eb | 5 | Eb – Gb – Bb – F – Ab – Cb | 0 3 7 2 5 8 |
| third inversion | Gb | b7 | Gb – Bb – F – Ab – Cb – Eb | 0 4 11 2 5 9 |
| fourth inversion | Bb | 9 | Bb – F – Ab – Cb – Eb – Gb | 0 7 10 1 5 8 |
| fifth inversion | F | 13 | F – Ab – Cb – Eb – Gb – Bb | 0 3 6 10 1 5 |
Playable voicings
These shapes were found by searching the fretboard of a standard-tuned guitar (E A D G B E) rather than copied from a chord book. The search allows every string to sound or to be muted, rejects any shape with a muted string between two sounding strings, rejects any shape whose fretted notes span more than four frets (a five-fret window), requires every chord tone to be present, and then sorts what remains with root-position shapes first and the most compact, lowest shapes next. The shapes shown are the first six of that ordering; other orderings are possible at the same frets.
| # | Shape (low string first) | Notes | Degrees | Bass | Span (frets) | Sounding strings |
|---|---|---|---|---|---|---|
| 1 | 4-2-3-3-4-2 | Ab B F Bb Eb Gb | 1 b3 13 9 5 b7 | Ab | 2 | 6 |
| 2 | 4-6-4-4-6-6 | Ab Eb Gb B F Bb | 1 5 b7 b3 13 9 | Ab | 2 | 6 |
| 3 | 4-1-3-4-4-2 | Ab Bb F B Eb Gb | 1 9 13 b3 5 b7 | Ab | 3 | 6 |
| 4 | 4-1-4-4-4-1 | Ab Bb Gb B Eb F | 1 9 b7 b3 5 13 | Ab | 3 | 6 |
| 5 | 4-2-4-3-4-1 | Ab B Gb Bb Eb F | 1 b3 b7 9 5 13 | Ab | 3 | 6 |
| 6 | 4-6-3-3-7-7 | Ab Eb F Bb Gb B | 1 5 13 9 b7 b3 | Ab | 4 | 6 |
Shape numbers run from the lowest string to the highest, so the left-hand number is the sixth string (low E) in standard tuning. Multiple shapes are listed because a chord can be voiced several ways, and because a lower position is not always the better sounding one.
Related chords and scales
- KeyEverything in Ab
- ScaleAb dorian
- ChordAbm11
- ChordAbm
- ChordAbm7
Related
- KeyKey of Ab
- ScaleAb dorian
- ChordAbm11 — Minor eleventh
- ChordAbm — Minor
- ChordAbm7 — Minor seventh
- ChordAb11 — Dominant eleventh
- ChordAb13 — Dominant thirteenth
- ChordAb9 — Dominant ninth