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.
Ebm7b5 is Eb, Gb, A and Db — Ebm7 with the fifth lowered a semitone.
It sounds hollow, and unmistakably going somewhere. Almost always the first chord of a minor ii–V–i, so it walks straight into an altered dominant.

| Eb | Gb | A | Db |
|---|---|---|---|
| 1 | ♭3 | ♭5 | ♭7 |
Pre-dominant — the ii of a minor key.
Also written Ebø, Ebø7, Ebm7-5, Ebm7(b5) or Eb half diminished. 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.
Ebm7b5 has 4 of them, on strings 5-3-2-1, strings 6-4-3-2, the middle four strings and the bottom four strings, from the 5th fret up to the 10th — all in one inversion, so the bass note never moves. The one to learn first is the Eb shape at the 5th fret.
Start with x6767x — no barre. None of the shapes for Ebm7b5 uses an open string, so every one of them is movable; the lowest sits at the 1st fret. 4 of the 8 need a barre. Together they cover the neck from the 1st fret to the 14th.
| Frets | Where | Bass | Top | Hand |
|---|---|---|---|---|
| xx1222 | 1st fret | Eb, root position | Gb | barred |
| x64645 | 4th fret | Eb, root position | A | all fretted |
| x6767x | 6th fret | Eb, root position | Gb | all fretted |
| xx7879 | 7th fret | Bbb, 2nd inversion | Db | all fretted |
| 11-x-x-11-10-9 | 9th fret | Eb, root position | Db | all fretted |
| 11-x-11-11-10-x | 10th fret | Eb, root position | A | barred |
| 11-12-13-11-14-11 | 11th fret | Eb, root position | Eb | barred |
| x-x-13-14-14-14 | 13th fret | Eb, root position | Gb | barred |
The same notes rebuilt from scratch give 13 drop 2, 9 drop 3 and 2 open string voicings, each on its own page.
Tensions. A shell of Ebm7b5, root, third and seventh, leaves a string free, and the tones that belong over it are the 11 (Ab) and the b13 (Cb).
Ebm7b5 is the ii of Db minor, which is where it is nearly always found: half-diminished, then an altered dominant, then the minor tonic.
In which keys. Every note of Ebm7b5 belongs to C# minor (the ii°, the supertonic) and E major (the vii°, the leading tone).
Every note of Ebm7b5 is in Eb blues, Eb locrian, Eb altered and Eb half-whole diminished.
Change one note of Ebm7b5 and you have Ebdim (drop the flat seventh), Ebdim7 (the flat seventh becomes a sixth), Ebm7 (the flat fifth becomes a fifth), EbmMaj7b5 (the flat seventh becomes a major seventh) or Eb7b5 (the minor third becomes a major third).
Ebm7b5 is a diminished chord — root, minor third, flat fifth. Diminished and half-diminished chords on every root.
On Ebm7b5’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.