A7 chord
A dominant seventh
<
1 / 1
>
3
5
7
10
The A7 chord has the formula 1, 3, 5, b7 with notes A, C#, E, G
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.