Bb7sus4 guitar chord
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.
- Tap a note to hear it
- Arrows change position
- Fingers, notes or intervals
- Play the chord
About Bb7sus4 — open string voicings
Bb7sus4 is Bb, Eb, F and Ab — Bb7 with the third replaced by the fourth.
It sounds leaning rather than shoving. It keeps the flat seventh’s pull and loses the tritone, so it moves without making a hard cadence.
Bb7sus4 notes and formula
| Bb | Eb | F | Ab |
|---|---|---|---|
| 1 | 4 | 5 | ♭7 |
Dominant — it points a fifth down, but softly.
Also written Bb7sus or Bb dominant 7 sus 4. The same chord either way; which spelling you meet depends on who wrote the chart.
How to play Bb7sus4
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.
Bb7sus4 has 1 of them, only on the bottom four strings, all of them at the 6th fret — all in one inversion, so the bass note never moves. The one to learn first is the Bb shape at the 6th fret, which is the easiest grip here.
Start with xxx344 — no barre and only 3 fretted notes. None of the shapes for Bb7sus4 uses an open string, so every one of them is movable; the lowest sits at the 1st fret. 3 of the 6 need a barre. Together they cover the neck from the 1st fret to the 13th.
| Frets | Where | Bass | Top | Hand |
|---|---|---|---|---|
| x13141 | 1st fret | Bb, root position | F | barred |
| xxx344 | 3rd fret | Bb, root position | Ab | all fretted |
| xx3344 | 3rd fret | F, 2nd inversion | Ab | all fretted |
| 686866 | 6th fret | Bb, root position | Bb | barred |
| x-x-8-10-9-11 | 8th fret | Bb, root position | Eb | all fretted |
| x-13-13-13-11-11 | 11th fret | Bb, root position | Eb | barred |
The same notes rebuilt from scratch give 7 shell, 13 drop 2 and 8 drop 3 voicings, each on its own page.
Tensions. A shell of Bb7sus4, 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 Bb7sus4
Voice by voice, Bb7sus4 → Eb. One voice moves by a semitone, and 2 notes are common to both chords.
| In Bb7sus4 | Moves | In Eb |
|---|---|---|
| Bb, the root | stays where it is | Bb, the fifth |
| Eb, the fourth | stays where it is | Eb, the root |
| F, the fifth | falls a whole tone | Eb, the root |
| Ab, the flat seventh | falls a semitone | G, the major third |
In which keys. Every note of Bb7sus4 belongs to C minor (the ♭VII), C# major (the vi), Eb major (the V), Eb minor (the v), F minor (the iv), F# major (the iii), Ab major (the ii) and Bb minor (the i).
What to play over Bb7sus4
Every note of Bb7sus4 is in Bb minor pentatonic, Bb blues, Bb mixolydian, Bb dorian and Bb natural minor.
Chords near Bb7sus4
Change one note of Bb7sus4 and you have Bbsus4 (drop the flat seventh), Bbsus2sus4 (the flat seventh becomes a ninth), Bbm7 (the fourth becomes a minor third), Bb7 (the fourth becomes a major third) or Bb11 (add the ninth).
Bb7sus4 is a suspended chord — root and fifth, with a second or fourth where the third would be — or nothing at all. Suspended and power chords on every root.
On Bb7sus4’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.