Finger Positions

Root Note D

Name D over C#

Intervals 1P-4P-5P-7m-9M

Relative Minor Bm

Notes C#, D, G, A, C, E

Aliases D9sus4, D9sus

How to play the D9sus4/C# Chord

The D9sus4/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 D over C# is built using the 1P, 4P, 5P, 7m, 9M intervals. In the key of D Major, this chord functions as the I chord.

Common Progressions

In music composition, the D9sus4/C# chord is often used to create tension or resolution.

I-V-vi-IV

D → A → Bm → G

vi-IV-I-V

Bm → G → D → A

The Diatonic Family

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

Triads

D Em F#m G A Bm C#dim

7ths

Dmaj7 Em7 F#m7 Gmaj7 A7 Bm7 C#m7b5

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 C#, D, G, A, C, E.

Acoustic & Digital Analysis

Digital footprint of the D9sus4/C# chord for MIDI programming and synthesizer sound design.

MIDI Numbers 61, 62, 67, 69, 60, 64

Frequencies (Hz)

277.1826309768721, 293.6647679174076, 391.99543598174927, 440, 261.6255653005986, 329.6275569128699