Db7 chord
Db dominant seventh
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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
F3
Gb
G
Ab
A
Bb
B
C
Db
D
Eb
E
F
A
Ab
A
Bb
Bb7
C
Db
D
Eb
E
F
Gb
G
Ab
A
B
3
5
7
10
The Db7 chord has the formula 1, 3, 5, b7 with notes Db, F, Ab, B
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.