Gb7 chord
Gb dominant seventh
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Gb
G
Ab
A
Bb3
B
C
Db
D
Eb
E
F
Gb
G
Bb
C
C
Db
D
Eb
Eb7
F
Gb
G
Ab
A
Bb
B
C
E
E
Eb
E
F
Gb1
G
Ab
A
Bb
B
C
Db
D
Eb
E
Gb
A
Ab
A
Bb
B
C
Db5
D
Eb
E
F
Gb
G
Ab
A
Db
3
5
7
10
The Gb7 chord has the formula 1, 3, 5, b7 with notes Gb, Bb, Db, E
The dominant seventh chord is a mildly dissonant variation of the major chord that is used in many genres, like blues, funk, and rock. In blues, entire progressions can be composed of dominant seventh chords.