Finger Positions

G#9b5/C# diagram
Root Note G#
Name G# over C#
Intervals 1P-3M-5d-7m-9M
Relative Minor Fm
Notes C#, G#, C, D, F#, A#
Aliases G#9b5

How to play the G#9b5/C# Chord

The G#9b5/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 G# over C# is built using the 1P, 3M, 5d, 7m, 9M intervals. In the key of G# Major, this chord functions as the I chord.

Common Progressions

In music composition, the G#9b5/C# chord is often used to create tension or resolution.

I-V-vi-IV

G# → D# → Fm → C#

vi-IV-I-V

Fm → C# → G# → D#

The Diatonic Family

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

Triads

G# A#m Cm C# D# Fm Gdim

7ths

G#maj7 A#m7 Cm7 C#maj7 D#7 Fm7 Gm7b5

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 C#, G#, C, D, F#, A#.

Acoustic & Digital Analysis

Digital footprint of the G#9b5/C# chord for MIDI programming and synthesizer sound design.

MIDI Numbers 61, 68, 60, 62, 66, 70
Frequencies (Hz)

277.1826309768721, 415.3046975799451, 261.6255653005986, 293.6647679174076, 369.9944227116344, 466.1637615180899