Bb Dominant 7th Sharp Fifth

Symbols:Bb7#5
Scale Degree Formula:1-3-#5-♭7
Interval Stack:M3 + M3 + M2
Notes:Bb, D, F#, G#
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, 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 (D). 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:
Bb1B♭2C2C#♭3D3D#4E♭5F5F##5G6G#♭7M3M3M2

Similar Chords

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

Chord TypeChords
7th Suspended SecondG#7sus2
Added 9thF#add9
AugmentedF#aug, Daug, Bbaug
Augmented Major 7thF#+Maj7, D+Maj7, Bb+Maj7
Dominant 7thBb7
Dominant 7th Flat FifthG#7b5, E7b5, D7b5, Bb7b5
Dominant 7th Flat ThirteenthBb7b13
Dominant 7th Sharp Five Flat 9thBb7#5b9
Dominant 7th Sharp Five Sharp 9thBb7#5#9
Dominant 9th Flat FifthG#9b5, E9b5
Dominant 9th Sharp FifthF#9#5, Bb9#5
Half-Diminished 7thG#m7(b5)
Major 2ndF#2
Major 7th Flat FifthDMaj7b5
Minor 6thBm6
Minor 9th Flat FifthG#m9b5
Minor Added 11thD#madd11
Minor Major 7thGmM7, D#mM7, BmM7

Associated Scales

This chord can be found in the following scales.

ScaleRoots
Dorian b5G#
Harmonic MajorF#
Harmonic MinorD#
Ionian #5F#
Locrian bb7F
Locrian ♮6F
Lydian #9B
Lydian Augmented #2D
Lydian b3B
Mixolydian b2C#
Phrygian DominantBb
Phrygian b4Bb
Super-Locrian bb7D
Ukrainian DorianG#

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