Finger Positions

F#9sus4/C# diagram
Root Note F#
Name F# over C#
Intervals 1P-4P-5P-7m-9M
Relative Minor D#m
Notes F#, B, C#, E, G#
Aliases F#9sus4, F#9sus

How to play the F#9sus4/C# Chord

The F#9sus4/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 F# over C# is built using the 1P, 4P, 5P, 7m, 9M intervals. In the key of F# Major, this chord functions as the I chord.

Common Progressions

In music composition, the F#9sus4/C# 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
Minor Bebop Dorian Mixolydian Piongio Mixolydian B6 Bebop Minor Minor Bebop Composite Blues Chromatic

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

Acoustic & Digital Analysis

Digital footprint of the F#9sus4/C# chord for MIDI programming and synthesizer sound design.

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

369.9944227116344, 493.8833012561241, 277.1826309768721, 329.6275569128699, 415.3046975799451