An open string left ringing against a fretted grip. Because it costs no finger, it sounds a note the closed shape has none left for -- a tension on top, or a pedal root underneath. Either a familiar grip with open strings added, or a shape so sparse the open strings carry the chord. These belong to their key rather than to a shape, so D, A, G and E have many and Eb a handful.
AbmMaj11 is Ab, Cb, Eb, G, Bb and Db — AbmMaj9 with the eleventh added on top.
It sounds dense and unresolved. Something is always omitted; the ♭3 and the natural 7 are what must not be.

| Ab | Cb | Eb | G | Bb | Db |
|---|---|---|---|---|---|
| 1 | ♭3 | 5 | 7 | 9 | 11 |
Minor tonic — the melodic minor as far up as a guitar carries it.
Also written AbmM11 or Abm(maj11). The same chord either way; which spelling you meet depends on who wrote the chart.
An open string left ringing against a fretted grip. It costs no finger, so it can sound a note the closed shape has none left for: a tension on top, or a pedal root underneath.
These belong to their key rather than to a shape: they cannot be moved up the neck. D, A, G and E have many; E♭ has a handful.
AbmMaj11 has 1 of them, only on the middle four strings, all of them at the 3rd fret — all in one inversion, so the bass note never moves. The one to learn first is the Db shape at the 3rd fret, which is the easiest grip here.
Start with xx6687 — no barre. None of the shapes for AbmMaj11 uses an open string, so every one of them is movable; the lowest sits at the 4th fret. 4 of the 6 need a barre. Together they cover the neck from the 4th fret to the 13th.
| Frets | Where | Bass | Top | Hand |
|---|---|---|---|---|
| 445446 | 4th fret | Ab, root position | Bb | barred |
| xx6687 | 6th fret | Ab, root position | Cb | all fretted |
| x66687 | 6th fret | Eb, 2nd inversion | Cb | barred |
| x-11-9-12-11-9 | 9th fret | Ab, root position | Db | all fretted |
| x-11-11-12-12-11 | 11th fret | Ab, root position | Eb | barred |
| x-11-11-13-13-11 | 11th fret | Ab, root position | Eb | barred |
The same notes rebuilt from scratch give 5 shell, 12 drop 2, 9 drop 3 and 24 rootless voicings, each on its own page.
Tensions. A shell of AbmMaj11, root, third and seventh, leaves a string free, and the tones that belong over it are the 13 (F).
How you get to it. The turn that lands on AbmMaj11 is Bbm7♭5 to Eb7♭9: the ii and the V of Ab minor, which is where a minor tonic is usually arrived at rather than simply begun on.
Every note of AbmMaj11 is in Ab harmonic minor and Ab melodic minor.
Change one note of AbmMaj11 and you have Abmaj11 (the minor third becomes a major third), Abm11 (the major seventh becomes a flat seventh) or AbmMaj9 (drop the fourth).
AbmMaj11 is a minor chord — root, minor third, fifth. Minor chords on every root.
On AbmMaj11’s sound and use this page follows Ted Pease & Ken Pullig, Modern Jazz Voicings (Berklee Press, 2001). 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.