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.
Dmaj7b5 is D, F#, Ab and C# — Dmaj7 with the fifth lowered a semitone.
It sounds hollow and hard to place. Far more often met spelled the other way round, as a ♯11 over a chord that kept its fifth.

| D | F# | Ab | C# |
|---|---|---|---|
| 1 | 3 | ♭5 | 7 |
Coloured tonic — rare, and unstable for a major chord.
Also written DM7b5, DΔ7b5 or Dmaj7(b5). 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.
Dmaj7b5 has 3 of them, on strings 6-5-4-3-2-1, strings 5-4-3-2-1 and strings 6-4-3-2-1, from the 3rd fret up to the 5th — every inversion the chord has: D in the bass and Ab in the bass. The one to learn first is the Ab shape at the 4th fret, which is the easiest grip here.
Start with xx0122 — no barre and 1 open string. 1 of the 6 shapes here sits in open position. 2 of the 6 need a barre. Together they cover the neck from the 1st fret to the 14th.
| Frets | Where | Bass | Top | Hand |
|---|---|---|---|---|
| xx0122 | open position | D, root position | F# | 1 open string |
| x54674 | 4th fret | D, root position | Ab | all fretted |
| x5667x | 5th fret | D, root position | F# | all fretted |
| 10-9-11-11-9-9 | 9th fret | D, root position | C# | barred |
| 10-11-11-11-x-10 | 10th fret | D, root position | D | barred |
| x-x-12-13-14-14 | 12th fret | D, root position | F# | all fretted |
The same notes rebuilt from scratch give 5 shell, 13 drop 2 and 9 drop 3 voicings, each on its own page.
Tensions. A shell of Dmaj7b5, root, third and seventh, leaves a string free, and the tones that belong over it are the 9 (E) and the 13 (B).
How you get to it. The turn that lands on Dmaj7b5 is Em7 to A7 — the ii and the V of D — and A7 shares its third and seventh with Em7, so the hand barely moves between them.
In which keys. Every note of Dmaj7b5 belongs to F# minor (the ♭VI) and A major (the IV, the subdominant).
Every note of Dmaj7b5 is in D lydian.
Change one note of Dmaj7b5 and you have Dmaj7 (the flat fifth becomes a fifth), Dmaj7#5 (the flat fifth becomes a sharp fifth), DmMaj7b5 (the major third becomes a minor third) or D7b5 (the major seventh becomes a flat seventh).
Dmaj7b5 is a major chord — root, major third, fifth. Major chords on every root.
On Dmaj7b5’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.