C# Minor Eleventh Flat Nine

Symbols:C#m11b9
Scale Degree Formula:1-♭3-5-♭7-♭9-11
Interval Stack:m3 + M3 + m3 + m3 + M3
Notes:C#, E, G#, B, D, F#
Hear this chord:▸ Guitar

Construction

Using the scale degree formula, we first start with the C# 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 lowest note of the chord (C#), then move our first interval (m3), which brings us to our second note in the chord (E). 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:
C#1D♭2D#2E♭3F3F#4G♭5G#5A#5Bb6B♭7C7C#8D♭9D#9E♭10F10F#11m3M3m3m3M3

Similar Chords

The following chords are similar to this chord and may be a suitable replacement in certain scenarios.

Chord TypeChords
7th Suspended Four Flat 9thC#7sus4b9
Dominant 6thE7(6)
Dominant 9thE9
Dominant 9th Flat ThirteenthF#9b13, E9b13
Dominant EleventhF#11, E11
Dominant Eleventh Flat NineC#11b9
Dominant ThirteenthE13
Major 9th Flat FifthDMaj9b5
Major EleventhAM11
Major ThirteenthAM13
Minor EleventhF#m11, C#m11, Bm11
Minor Six-NineBm6/9
Minor ThirteenthBm13
Six-NineE6/9

Associated Scales

This chord can be found in the following scales.

ScaleRoots
DorianB
LocrianG#
LydianD
MajorA
MinorF#
MixolydianE
PhrygianC#

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