A7 Guitar Chord
A7 is a four-note dominant seventh chord built from A, C#, E, G. Adding a minor seventh to the major triad creates tension that most naturally resolves to D major, making it the classic V7 chord in the key of D.
Notes in the A Dominant 7th Chord
The A Dominant 7th chord is built from 4 notes: A, C#, E, G. It is a dominant 7th chord — built from a root, major third, perfect fifth, and minor seventh (10 semitones above the root). On guitar, these notes are voiced across multiple strings simultaneously to create the full chord sound. Depending on the voicing, some notes may be doubled in different octaves to fill out the sound.
Keys That Contain A Dominant 7th
A7 is built on the A major chord, which appears diatonically in these keys:
Common Chord Progressions with A7
A Dominant 7th appears in many common progressions. Here are the most-used patterns when A7 is the tonic chord:
Use our chords in a key tool to find all the chords that naturally pair with A7 in any key.
Frequently Asked Questions
What notes are in the A Dominant 7th chord?
The A Dominant 7th chord is made up of A, C#, E, G. These 4 notes form a four-note chord structure.
What key is the A Dominant 7th chord in?
A Dominant 7th naturally appears in the keys of D Major, A Major, E Major. It can also appear in other contexts as a borrowed chord or secondary chord.
How do I play the A7 chord on guitar?
Place your fingers on the guitar fretboard according to the diagram above. The numbered dots show finger placement (1 = index, 2 = middle, 3 = ring, 4 = pinky), "O" means play the string open, and "X" means mute that string.
Other A Chords
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