Symbols:C#m9b5
C# Minor 9th Flat Fifth
Scale Degree Formula:1-♭3-♭5-♭7-9
Interval Stack:m3 + m3 + M3 + M3
Notes:C#, E, G, B, D#
Hear this chord:▸ Synth
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, 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 (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:
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 | F#7sus4b9 |
| Dominant 7th Flat 9th | D#7b9 |
| Dominant 7th Flat Five Flat 9th | D#7b5b9 |
| Dominant 7th Flat Nine Flat Thirteenth | D#7b9b13 |
| Dominant 7th Flat Thirteenth | D#7b13 |
| Dominant 7th Sharp Fifth | D#7#5 |
| Dominant 7th Sharp Five Flat 9th | D#7#5b9 |
| Dominant 7th Sharp Five Sharp 9th | D#7#5#9 |
| Dominant 9th | A9 |
| Dominant 9th Flat Fifth | C#9b5, A9b5 |
| Dominant 9th Sharp Fifth | D#9#5, B9#5 |
| Half-Diminished 7th | C#m7(b5) |
| Minor 6th | Em6 |
| Minor 9th | C#m9 |
| Minor Major 7th | EmM7 |
| Minor Major 9th | EmMaj9 |
| Minor Six-Nine | Em6/9 |
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