A dominant seventh chord

A7 chord for piano with keyboard diagram.
Explanation: The A dominant seventh is a four note chord. You can see the four notes of the A seventh chord marked in red color. The chord is often abbreviated as A7.
Theory: The A seventh chord is constructed with a root, a major third, a perfect fifth and a minor seventh.
Fingerings: little finger, middle finger, index finger, thumb (left hand); thumb, index finger, middle finger, little finger (right hand).

A7

A7 chord diagram
Notes: A - C# - E - G

Ab7 chord ‹ Previous • Next › A#7 chord

+  Show inversions: A7/C#, A7/E, A7/G -  Hide inversions

A7 - inversions

Explanation: The images below show the three inversions of the A dominant seventh chord. A7/C# is a A dominant seventh with C# as the bass note, A7/E is a A dominant seventh with E as the bass note and A7/G is a A dominant seventh with G as the bass note. Note that the fifth sometimes are omitted.

A7/C#

A7/C# chord diagram
1st inversion

A7/E

A7/E chord diagram
2nd inversion

A7/G

A7/G chord diagram
3rd inversion

A chord categories

A Am A7 Am7 Amaj7 A6 Am6 A6/9 A9 Am9 Amaj9 A11 A13 Aadd A7-5 A7+5 Asus Adim Aaug