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.
EbmMaj7b5 is Eb, Gb, A and D — Ebm7b5 with the seventh raised a semitone.
It sounds brittle and impossible to mistake. Scarce enough that most players meet it as a passing sonority rather than as a chord they chose.

| Eb | Gb | A | D |
|---|---|---|---|
| 1 | ♭3 | ♭5 | 7 |
Rare tonic — a half-diminished chord with its seventh raised instead.
Also written EbmM7b5 or Ebm(maj7)b5. 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.
EbmMaj7b5 has 3 of them, on strings 5-3-2-1, strings 6-4-3-2 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 xx1232 — no barre and down at the nut. None of the shapes for EbmMaj7b5 uses an open string, so every one of them is movable; the lowest sits at the 1st fret. 2 of the 6 need a barre. Together they cover the neck from the 1st fret to the 15th.
| Frets | Where | Bass | Top | Hand |
|---|---|---|---|---|
| xx1232 | 1st fret | Eb, root position | Gb | all fretted |
| x6x775 | 5th fret | Eb, root position | A | all fretted |
| x6777x | 6th fret | Eb, root position | Gb | barred |
| 11-12-x-11-10-10 | 10th fret | Eb, root position | D | all fretted |
| 11-12-12-11-x-11 | 11th fret | Eb, root position | Eb | barred |
| x-x-13-14-15-14 | 13th fret | Eb, root position | Gb | all fretted |
The same notes rebuilt from scratch give 13 drop 2, 9 drop 3 and 6 open string voicings, each on its own page.
Tensions. A shell of EbmMaj7b5, root, third and seventh, leaves a string free, and the tones that belong over it are the 11 (Ab) and the b13 (Cb).
Every note of EbmMaj7b5 is in Eb diminished.
Change one note of EbmMaj7b5 and you have Ebdim (drop the major seventh), Ebdim7 (the major seventh becomes a sixth), Ebmaj7b5 (the minor third becomes a major third), Ebm7b5 (the major seventh becomes a flat seventh) or EbmMaj7 (the flat fifth becomes a fifth).
EbmMaj7b5 is a diminished chord — root, minor third, flat fifth. Diminished and half-diminished chords on every root.
On EbmMaj7b5’s sound and use this page follows Robert Rawlins & Nor Eddine Bahha, Jazzology (Hal Leonard, 2005). 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.