Finger Positions

F#9/B diagram
Root Note F#
Name F# dominant ninth over B
Intervals 1P-3M-5P-7m-9M
Relative Minor D#m
Notes B, F#, A#, C#, E, G#
Aliases F#9

How to play the F#9/B Chord

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

Common Progressions

In music composition, the F#9/B chord is often used to create tension or resolution.

I-V-vi-IV

F# → C# → D#m → B

vi-IV-I-V

D#m → B → F# → C#

The Diatonic Family

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

Triads

F# G#m A#m B C# D#m Fdim

7ths

F#maj7 G#m7 A#m7 Bmaj7 C#7 D#m7 Fm7b5

Scale Compatibility

View All Scales
Bebop Mixolydian Mixolydian B6 Lydian Dominant Lydian Minor Bebop Minor Composite Blues Messiaen's Mode #3 Chromatic

* 9 scales found containing the notes B, F#, A#, C#, E, G#.

Acoustic & Digital Analysis

Digital footprint of the F#9/B chord for MIDI programming and synthesizer sound design.

MIDI Numbers 71, 66, 70, 61, 64, 68
Frequencies (Hz)

493.8833012561241, 369.9944227116344, 466.1637615180899, 277.1826309768721, 329.6275569128699, 415.3046975799451