Finger Positions

Root Note B

Name B over F#

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

Relative Minor G#m

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

Aliases B9b5

How to play the B9b5/F# Chord

The B9b5/F# 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 over F# is built using the 1P, 3M, 5d, 7m, 9M intervals. In the key of B Major, this chord functions as the I chord.

Common Progressions

In music composition, the B9b5/F# 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

Prometheus Whole Tone Locrian Major Lydian Dominant Leading Whole Tone Lydian Minor Messiaen's Mode #6 Composite Blues Messiaen's Mode #3 Chromatic

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

Acoustic & Digital Analysis

Digital footprint of the B9b5/F# chord for MIDI programming and synthesizer sound design.

MIDI Numbers 66, 71, 63, 65, 69, 61

Frequencies (Hz)

369.9944227116344, 493.8833012561241, 311.1269837220809, 349.2282314330039, 440, 277.1826309768721