Bbmaj7b5 guitar chord
The third voice from the top lowered an octave. The dropped voice becomes the bass, which is why a string is skipped.
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About Bbmaj7b5 — drop 3 voicings
Bbmaj7b5 is Bb, D, Fb and A — Bbmaj7 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.
Bbmaj7b5 notes and formula
| Bb | D | Fb | A |
|---|---|---|---|
| 1 | 3 | ♭5 | 7 |
Coloured tonic — rare, and unstable for a major chord.
Also written BbM7b5, BbΔ7b5 or Bbmaj7(b5). The same chord either way; which spelling you meet depends on who wrote the chart.
How to play Bbmaj7b5
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.
Bbmaj7b5 has 9 of them, on strings 5-3-2-1 and strings 6-4-3-2, from open position up to the 12th — every inversion the chord has: Bb in the bass, D in the bass, Fb in the bass and A in the bass. The one to learn first is the Bb shape at the nut.
5 of them sit on strings 5-3-2-1, 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 x1223x — no barre and down at the nut. None of the shapes for Bbmaj7b5 uses an open string, so every one of them is movable; the lowest sits at the 1st fret. 3 of the 7 need a barre. Together they cover the neck from the 1st fret to the 15th.
| Frets | Where | Bass | Top | Hand |
|---|---|---|---|---|
| x1223x | 1st fret | Bb, root position | D | all fretted |
| 657755 | 5th fret | Bb, root position | A | barred |
| 6777x0 | 6th fret | Bb, root position | Fb | barred |
| 6777x6 | 6th fret | Bb, root position | Bb | barred |
| x-x-8-9-10-10 | 8th fret | Bb, root position | D | all fretted |
| x-13-12-14-15-12 | 12th fret | Bb, root position | Fb | all fretted |
| x-13-14-14-15-x | 13th fret | Bb, root position | D | all fretted |
The same notes rebuilt from scratch give 7 shell, 14 drop 2 and 6 open string voicings, each on its own page.
Tensions. A shell of Bbmaj7b5, root, third and seventh, leaves a string free, and the tones that belong over it are the 9 (C) and the 13 (G).
How to use Bbmaj7b5
How you get to it. The turn that lands on Bbmaj7b5 is Cm7 to F7 — the ii and the V of Bb — and F7 shares its third and seventh with Cm7, so the hand barely moves between them.
In which keys. Every note of Bbmaj7b5 belongs to D minor (the ♭VI) and F major (the IV, the subdominant).
What to play over Bbmaj7b5
Every note of Bbmaj7b5 is in Bb lydian.
Chords near Bbmaj7b5
Change one note of Bbmaj7b5 and you have Bbmaj7 (the flat fifth becomes a fifth), Bbmaj7#5 (the flat fifth becomes a sharp fifth), BbmMaj7b5 (the major third becomes a minor third) or Bb7b5 (the major seventh becomes a flat seventh).
Bbmaj7b5 is a major chord — root, major third, fifth. Major chords on every root.
On Bbmaj7b5’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.