Finger Positions

F#add9/C# diagram
Root Note F#
Name F# over C#
Intervals 1P-3M-5P-9M
Relative Minor D#m
Notes F#, A#, C#, G#
Aliases F#Madd9, F#2, F#add9, F#add2

How to play the F#add9/C# Chord

The F#add9/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, 3M, 5P, 9M intervals. In the key of F# Major, this chord functions as the I chord.

Common Progressions

In music composition, the F#add9/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
Major Pentatonic Major Major Blues Bebop Lydian Mixolydian Flat Six Pentatonic Mixolydian B6 Lydian Dominant Lydian Minor Harmonic Major Bebop Minor Bebop Major Ichikosucho Composite Blues

* 15 scales found containing the notes F#, A#, C#, G#.

Acoustic & Digital Analysis

Digital footprint of the F#add9/C# chord for MIDI programming and synthesizer sound design.

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

369.9944227116344, 466.1637615180899, 277.1826309768721, 415.3046975799451