C#7sus4 chord
C# dominant seventh suspended fourth
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G
F#
G
G#5
A
A#
B
C
C#
D
D#
E
F
F#
G
G#
C
C
C#1
D
D#
E
F
F#
G
G#
A
A#
B
C
C#
E
D#
E
F
F#4
G
G#
A
A#
B
C
C#
D
D#
E
F#
A
G#
A
A#
Bb7
C
C#
D
D#
E
F
F#
G
G#
A
B
3
5
7
10
The C#7sus4 chord has the formula 1, 4, 5, b7 with notes C#, F#, G#, B
The seventh suspended fourth chord is a variation of the suspended fourth chord, meaning that it does not have a third and sounds open. This chord can be used to prepare for a resolution down toward a third.