Symbols:Bbm11b9
Bb Minor Eleventh Flat Nine
Scale Degree Formula:1-♭3-5-♭7-♭9-11
Interval Stack:m3 + M3 + m3 + m3 + M3
Notes:Bb, C#, F, G#, B, D#
Hear this chord:▸ Synth
Construction
Using the scale degree formula, we first start with the Bb major scale, and number each note in the scale starting from 1 - these are the scale degrees. Next, we use the scale degree formula, in this case 1-♭3-5-♭7-♭9-11, to select notes from our enumerated scale. When a chord requires notes that are not in the scale, this is indicated with a flat (♭) or a sharp (#) along with the scale degree; a ♭3, for instance, would be one half-step down from the 3rd scale degree.Alternatively, we can use the interval stack to construct our chord. With this approach, we first start with the root of the chord (Bb), then move our first interval (m3), which brings us to our second note in the chord (C#). We repeatedly apply each of the remaining intervals in the stack to get the full list of notes for our chord.
The diagram below shows how both the scale degree formula and interval stack
methods result in the same selection of notes:
Similar Chords
The following chords are similar to this chord and may be a suitable replacement in certain scenarios.
| Chord Type | Chords |
|---|---|
| 7th Suspended Four Flat 9th | Bb7sus4b9 |
| Dominant 6th | C#7(6) |
| Dominant 9th | C#9 |
| Dominant 9th Flat Thirteenth | D#9b13, C#9b13 |
| Dominant Eleventh | D#11, C#11 |
| Dominant Eleventh Flat Nine | Bb11b9 |
| Dominant Thirteenth | C#13 |
| Major 9th Flat Fifth | BMaj9b5 |
| Major Eleventh | F#M11 |
| Major Thirteenth | F#M13 |
| Minor Eleventh | G#m11, D#m11, Bbm11 |
| Minor Six-Nine | G#m6/9 |
| Minor Thirteenth | G#m13 |
| Six-Nine | C#6/9 |
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