B7 chord
B dominant seventh
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G
F#
G
G#
Ab7
A#
B
C
C#
D
D#
E
F
F#
G
A
C
C
C#
D
D#3
E
F
F#
G
G#
A
A#
B
C
D#
E
D#
E
F
F#5
G
G#
A
A#
B
C
C#
D
D#
E
F#
A
G#
A
A#
B1
C
C#
D
D#
E
F
F#
G
G#
A
B
3
5
7
10
The B7 chord has the formula 1, 3, 5, b7 with notes B, D#, F#, A
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.