The third voice from the top lowered an octave. The dropped voice becomes the bass, which is why a string is skipped.
Ebmaj13 is Eb, G, Bb, D, F and C — Ebmaj9 with the thirteenth on top, and the eleventh left out.
It sounds full and wide open. Six notes into four fingers means something goes: keep the third, the seventh and the thirteenth.

| Eb | G | Bb | D | F | C |
|---|---|---|---|---|---|
| 1 | 3 | 5 | 7 | 9 | 13 |
Tonic — the major sound with most of the scale showing.
Also written EbM13, EbΔ13 or Eb major 13. The same chord either way; which spelling you meet depends on who wrote the chart.
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.
Ebmaj13 has 8 of them, on strings 6-4-3-2 and strings 5-3-2-1, from open position up to the 11th — every inversion the chord has: Eb in the bass, G in the bass, D in the bass and C in the bass. The one to learn first is the G shape at the nut.
4 of them sit on strings 6-4-3-2, 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 x3103x — no barre and 1 open string. 1 of the 7 shapes here sits in open position. 4 of the 7 need a barre. Together they cover the neck from the 1st fret to the 13th.
| Frets | Where | Bass | Top | Hand |
|---|---|---|---|---|
| x31133 | 1st fret | C, 13th in the bass | G | barred |
| x3103x | open position | C, 13th in the bass | D | 1 open string |
| x65533 | 3rd fret | Eb, root position | G | all fretted |
| x63533 | 3rd fret | Eb, root position | G | barred |
| x66788 | 6th fret | Eb, root position | C | all fretted |
| 11-10-10-10-11-10 | 10th fret | Eb, root position | D | barred |
| 11-11-12-12-13-11 | 11th fret | Eb, root position | Eb | barred |
The same notes rebuilt from scratch give 3 shell, 13 drop 2, 25 rootless and 1 open string voicings, each on its own page.
Tensions. A shell of Ebmaj13, root, third and seventh, leaves a string free, and the tones that belong over it are the #11 (A).
How you get to it. The turn that lands on Ebmaj13 is Fm7 to Bb7 — the ii and the V of Eb — and Bb7 shares its third and seventh with Fm7, so the hand barely moves between them.
In which keys. Every note of Ebmaj13 belongs to C minor (the ♭III), Eb major (the I, the tonic), G minor (the ♭VI) and Bb major (the IV, the subdominant).
Every note of Ebmaj13 is in Eb major and Eb lydian.
Change one note of Ebmaj13 and you have Ebmaj9 (drop the sixth), Ebmaj11 (the sixth becomes a fourth), Eb69 (drop the major seventh) or Eb13 (the major seventh becomes a flat seventh).
Ebmaj13 is a major chord — root, major third, fifth. Major chords on every root.
On Ebmaj13’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.