Finger Positions

Root Note C#

Name C# seventh suspended fourth sharp fifth over A

Intervals 1P-4P-5A-7m

Relative Minor A#m

Notes C#, F#, A, B

Aliases

How to play the C#7sus4#5/A Chord

The C#7sus4#5/A 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 C# seventh suspended fourth sharp fifth over A is built using the 1P, 4P, 5A, 7m intervals. In the key of C# Major, this chord functions as the I chord.

Common Progressions

In music composition, the C#7sus4#5/A chord is often used to create tension or resolution.

I-V-vi-IV

C# → G# → A#m → F#

vi-IV-I-V

A#m → F# → C# → G#

The Diatonic Family

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

Triads

C# D#m Fm F# G# A#m Cdim

7ths

C#maj7 D#m7 Fm7 F#maj7 G#7 A#m7 Cm7b5

Scale Compatibility

View All Scales

* 0 scales found containing the notes C#, F#, A, B.

Acoustic & Digital Analysis

Digital footprint of the C#7sus4#5/A chord for MIDI programming and synthesizer sound design.

MIDI Numbers 61, 66, 69, 71

Frequencies (Hz)

277.1826309768721, 369.9944227116344, 440, 493.8833012561241