Finger Positions

Root Note B

Name B dominant flat ninth over C#

Intervals 1P-3M-5P-7m-9m

Relative Minor G#m

Notes C#, B, D#, F#, A, C

Aliases B7b9

How to play the B7b9/C# Chord

The B7b9/C# is a fundamental dominant chord in guitar music. To play this chord correctly, ensure your fingers are placed precisely on the frets indicated in the diagram above.

Music Theory Analysis

From a theoretical perspective, the B dominant flat ninth over C# is built using the 1P, 3M, 5P, 7m, 9m intervals. In the key of B Major, this chord functions as the I chord.

Common Progressions

In music composition, the B7b9/C# chord is often used to create tension or resolution.

I-V-vi-IV

B → F# → G#m → E

vi-IV-I-V

G#m → E → B → F#

The Diatonic Family

Understanding the "family" of chords that belong to B helps with transposition and ear training.

Triads

B C#m D#m E F# G#m A#dim

7ths

Bmaj7 C#m7 D#m7 Emaj7 F#7 G#m7 A#m7b5

Scale Compatibility

View All Scales

Phrygian Dominant Flamenco Spanish Heptatonic Half-Whole Diminished Chromatic

* 5 scales found containing the notes C#, B, D#, F#, A, C.

Acoustic & Digital Analysis

Digital footprint of the B7b9/C# chord for MIDI programming and synthesizer sound design.

MIDI Numbers 61, 71, 63, 66, 69, 60

Frequencies (Hz)

277.1826309768721, 493.8833012561241, 311.1269837220809, 369.9944227116344, 440, 261.6255653005986