Root, third and seventh: the guide tones fix the quality, so the fifth is dropped. That is what leaves a string free, so pick a tension to put on top.
Eb9 is Eb, G, Bb, Db and F — Eb7 with the ninth stacked on top.
It sounds bright and full, still clearly pulling. The ninth adds height without softening the tritone underneath it, which is why funk and soul comp on this rather than on a plain 7.

| Eb | G | Bb | Db | F |
|---|---|---|---|---|
| 1 | 3 | 5 | ♭7 | 9 |
Dominant — the same pull as a 7, with more colour.
Also written Ebdom9 or Eb dominant 9. The same chord either way; which spelling you meet depends on who wrote the chart.
Root, third and seventh. The third and seventh, the guide tones, are what make the chord major, minor or dominant, so the fifth can go: it says nothing the symbol needs.
Three notes means a spare string, which is the real point. Put a tension on it.
Eb9 has 5 of them, on the top four strings, the middle four strings, the bottom four strings and strings 5-3-2-1, from open position up to the 12th — all in one inversion, so the bass note never moves. The one to learn first is the Eb shape at the nut, which is the easiest grip here.
Start with xx1021 — no barre and 1 open string. 1 of the 9 shapes here sits in open position. 5 of the 9 need a barre. Together they cover the neck from the 1st fret to the 15th.
| Frets | Where | Bass | Top | Hand |
|---|---|---|---|---|
| xx1021 | open position | Eb, root position | F | 1 open string |
| x65666 | 5th fret | Eb, root position | Bb | barred |
| x88889 | 8th fret | F, 9th in the bass | Db | barred |
| 11-8-8-10-8-9 | 8th fret | Eb, root position | Db | barred |
| 11-10-11-10-x-x | 10th fret | Eb, root position | F | all fretted |
| 11-13-11-10-11-13 | 10th fret | Eb, root position | F | barred |
| 11-13-11-12-11-13 | 11th fret | Eb, root position | F | barred |
| x-x-13-12-14-13 | 12th fret | Eb, root position | F | all fretted |
| 15-x-13-15-14-13 | 13th fret | G, 1st inversion | F | all fretted |
The same notes rebuilt from scratch give 13 drop 2, 9 drop 3, 15 rootless and 2 open string voicings, each on its own page.
Tensions. A shell of Eb9, root, third and seventh, leaves a string free, and the tones that belong over it are the #11 (A), the b13 (Cb) and the 13 (C).
Eb9 is the V of Ab, and that is where it goes if it goes anywhere: the third and the flat seventh are a tritone apart, and both resolve by a semitone into Ab.
Voice by voice, Eb9 → Ab. 2 voices move by a semitone, and one note is common to both chords.
| In Eb9 | Moves | In Ab |
|---|---|---|
| Eb, the root | stays where it is | Eb, the fifth |
| G, the major third | rises a semitone | Ab, the root |
| Bb, the fifth | falls a whole tone | Ab, the root |
| Db, the flat seventh | falls a semitone | C, the major third |
| F, the ninth | falls a whole tone | Eb, the fifth |
In which keys. Every note of Eb9 belongs to F minor (the ♭VII) and Ab major (the V, the dominant).
Every note of Eb9 is in Eb mixolydian and Eb lydian dominant.
Change one note of Eb9 and you have Ebmaj9 (the flat seventh becomes a major seventh), Ebm9 (the major third becomes a minor third), Ebadd9 (drop the flat seventh), Eb69 (the flat seventh becomes a sixth), Eb7 (drop the ninth) or Eb9b5 (the fifth becomes a flat fifth).
Eb9 is a dominant chord — root, major third, fifth, minor seventh. Dominant seventh chords on every root.
On Eb9’s sound and use this page follows Mark Levine, The Jazz Theory Book (Sher Music, 1995). 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.