Db7sus4 chord
Db dominant seventh suspended fourth
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G
Gb
G
Ab5
A
Bb
B
C
Db
D
Eb
E
F
Gb
G
Ab
C
C
Db1
D
Eb
E
F
Gb
G
Ab
A
Bb
B
C
Db
E
Eb
E
F
Gb4
G
Ab
A
Bb
B
C
Db
D
Eb
E
Gb
A
Ab
A
Bb
Bb7
C
Db
D
Eb
E
F
Gb
G
Ab
A
B
3
5
7
10
The Db7sus4 chord has the formula 1, 4, 5, b7 with notes Db, Gb, Ab, 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.