C# Dominant 7th Sharp Fifth

Symbols:C#7#5
Scale Degree Formula:1-3-#5-♭7
Interval Stack:M3 + M3 + M2
Notes:C#, F, A, B
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, 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 (F). 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♭7M3M3M2

Similar Chords

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

Chord TypeChords
7th Suspended SecondB7sus2
Added 9thAadd9
AugmentedFaug, C#aug, Aaug
Augmented Major 7thF+Maj7, C#+Maj7, A+Maj7
Dominant 7thC#7
Dominant 7th Flat FifthG7b5, F7b5, C#7b5, B7b5
Dominant 7th Flat ThirteenthC#7b13
Dominant 7th Sharp Five Flat 9thC#7#5b9
Dominant 7th Sharp Five Sharp 9thC#7#5#9
Dominant 9th Flat FifthG9b5, B9b5
Dominant 9th Sharp FifthC#9#5, A9#5
Half-Diminished 7thBm7(b5)
Major 2ndA2
Major 7th Flat FifthFMaj7b5
Minor 6thDm6
Minor 9th Flat FifthBm9b5
Minor Added 11thF#madd11
Minor Major 7thF#mM7, DmM7, BbmM7

Associated Scales

This chord can be found in the following scales.

ScaleRoots
Dorian b5B
Harmonic MajorA
Harmonic MinorF#
Ionian #5A
Locrian bb7G#
Locrian ♮6G#
Lydian #9D
Lydian Augmented #2F
Lydian b3D
Mixolydian b2E
Phrygian DominantC#
Phrygian b4C#
Super-Locrian bb7F
Ukrainian DorianB

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