The A7 piano chord is a dominant 7th chord with the notes A, C#, E, G. On piano it is played from the keys A, C#, E, G, root position first, then in inversions. Whether you are learning it for the first time or checking a voicing, this page has the notes, the piano fingerings, the inversions and alternatives, and the progressions it appears in.
What notes are in the A7 chord?
The A7 chord is a dominant 7th chord, and its notes are fixed: A, C#, E, G. Every voicing on every instrument uses these same notes, in some order and in some octave — change one of them and you are playing a different chord. The table below lists each note with its interval from the root A, so you can see the structure of A7 at a glance. On the piano, A7 is the keys A, C#, E, G, and the inversions above move the same notes around.
| Note | Interval |
|---|---|
| A | Root |
| C# | 3 |
| E | 5 |
| G | b7 |
The root is A, the note the chord is named after and the note your ear hears as home. Above it, the intervals in A7 are 3, 5, b7. Learn those intervals rather than memorising the shape alone, because the same interval pattern transposed to another root gives you the same quality of chord anywhere. On the piano, the notes appear in the order the fingering dictates, but the set of notes never changes.
A7 sounds bluesy and restless — the flattened 7th ({flat7}) pulls the chord forward and makes it want to resolve. The colour is strongest when all the notes ring clearly. A muted chord tone, especially the 3rd or the 7th where the chord has one, flattens the character of A7 noticeably. On the piano, the root-position keys A, C#, E, G show A7 most clearly.
Comparing A7 with its closest relatives helps to fix it in your ear. In short, dominant 7th against major 7th: A7 uses the flattened 7th G, while the major 7th version uses G#. One semitone separates a bluesy pull from a dreamy shimmer. Practise the two chords back to back and listen to the one note that changes — that single note is the difference between the two chords. On the piano, play the keys A, C#, E, G slowly and listen for each note of A7 in turn.
How to play A7 on piano
On the piano, A7 is played from the keys A, C#, E, G. In root position the lowest note is A, the root, with the other notes stacked above it in the order A, C#, E, G. Play it with the right hand first, then with the left hand an octave lower, so both hands know the shape of A7 before you try it in a progression.
First inversion of A7 puts C# in the bass, with the notes in the order C#, E, G, A. The chord is still A7 — the notes have not changed, only their order — but the bass note changes how it connects to the chord before and after it. Use this inversion when the bass line wants to step to C# rather than jump to A, and practise moving from root position to this inversion without lifting your hand off the keys more than you must.
Second inversion of A7 puts E in the bass, with the notes in the order E, G, A, C#. The chord is still A7 — the notes have not changed, only their order — but the bass note changes how it connects to the chord before and after it. Use this inversion when the bass line wants to step to E rather than jump to A, and practise moving from root position to this inversion without lifting your hand off the keys more than you must.
Third inversion of A7 puts G in the bass, with the notes in the order G, A, C#, E. The chord is still A7 — the notes have not changed, only their order — but the bass note changes how it connects to the chord before and after it. Use this inversion when the bass line wants to step to G rather than jump to A, and practise moving from root position to this inversion without lifting your hand off the keys more than you must.
For fingering, a good starting point for A7 in root position in the right hand is thumb on A, then one finger per note in order, with the little finger on the top note G. For the left hand, mirror it: little finger on the low A and thumb on the top note. When a note is a black key — C# — let your longer fingers take it, since they reach the black keys more easily. Practise A7 in root position and first inversion, hands separately, then together, at a slow tempo, and use the Piano Chord Finder to check the voicing on the keyboard.
Common mistakes
These are the mistakes that most often make A7 sound wrong on the piano, and each one has a concrete fix. Work through them one at a time rather than trying to fix everything at once.
Playing every inversion with the same hand shape. Each inversion of A7 needs its own hand shape, because the notes sit under different fingers. If you force the root-position fingering onto an inversion, the hand cramps and notes get missed. Learn the fingering for each inversion of A7 separately, hands apart, before you join them. On the piano, A7 is the keys A, C#, E, G, and the inversions above move the same notes around.
Playing a major 7th instead. If the 7th comes out as G# rather than G, you have the major 7th chord. Lower that note by one semitone — one fret, or one key down. On the piano, the root-position keys A, C#, E, G show A7 most clearly.
Forgetting the 7th altogether. Without G this is just a major triad, and the dominant pull disappears. Make sure the note carrying the 7th actually sounds. On the piano, A7 is the keys A, C#, E, G, and the inversions above move the same notes around.
Resolving it nowhere. A7 wants to move, usually to the tonic a fourth above its root. Practise the V7–I move so the resolution lands cleanly. On the piano, A7 is the keys A, C#, E, G, and the inversions above move the same notes around.
Where A7 is used
A7 is not a diatonic triad in any major or minor key, because it is an extended or altered chord, but its base triad belongs to the key of D major, the key of E major, the key of A major. a secondary dominant that can tonicise another chord — V7 of almost anything. As a dominant-type chord it also points toward D major, the key a perfect fourth above A, which is the tonic it most often resolves to. That is where A7 does its work: not as a home chord, but as a chord that creates movement and then resolves. On the piano, A7 is the keys A, C#, E, G, and the inversions above move the same notes around.
You will meet A7 in progressions such as 12 bar blues progression in D major, 12 bar blues progression in E major, 12 bar blues progression in A major. Try playing one of those progressions slowly and listening to how A7 behaves in context — whether it sounds like home, like a lift, or like a chord pulling toward the next one. That context is the fastest way to learn what A7 is for, because a chord on its own tells you its notes, but a chord in a progression tells you its job. On the piano, A7 is the keys A, C#, E, G, and the inversions above move the same notes around.
The same chord on other instruments is covered in A7 on guitar, A7 on ukulele, A7 on bass, and the scales that fit over it are the A major scale and the A minor pentatonic scale. Learning A7 on the piano and then checking it on another instrument is one of the best ways to fix the notes — A, C#, E, G — in your memory, because the notes stay the same while everything else changes.
Practising A7
A short worked example makes A7 concrete. Play the four-chord progression D – A – Bm – G in D major, the key A7 most often resolves toward: D – A – Bm – G. Play each chord for one bar at a slow tempo, and listen to how A7 sounds in that sequence — whether it feels like home, like a lift, or like a chord on its way somewhere else. Then play the same four chords in a different order, starting on A7 itself, and notice how its character changes when it opens the progression instead of sitting inside it. On the piano, play the keys A, C#, E, G slowly and listen for each note of A7 in turn.
For a second exercise, play A7 and then the chord a fourth above A, back and forth, four times each. That move — a chord and the chord a fourth above it — is the most common resolution in Western music, and it is the move A7 is built for when it acts as a dominant. Finish by playing A7 on its own, slowly, and naming each note out loud as you play it: A, C#, E, G. Naming the notes while you play them is what turns a shape into knowledge you can use in any key. Test yourself with the Practice Chord Quiz and keep time with the Metronome as the tempo rises. On the piano, A7 is the keys A, C#, E, G, and the inversions above move the same notes around.
Frequently asked questions
What is the first inversion of A7?
The first inversion of A7 puts C# in the bass, with the notes in the order C#, E, G, A. The chord is still A7 — only the bass note has changed — and it is the inversion to use when the bass line steps to C#.
Which fingers do you use for A7 on piano?
In the right hand, start with the thumb on A and one finger per note in order, ending with the little finger on G. In the left hand, mirror it with the little finger on the low A. Longer fingers take the black keys, so check which notes of A7 are black keys before you settle on a fingering.
What is the difference between A7 and Amaj7?
A7 has the flattened 7th G, while Amaj7 has the major 7th G#. That one note changes the function completely: A7 is a dominant chord that wants to resolve, Amaj7 is a settled, jazzy tonic colour. On the piano, the keys above put that note under your fingers.
Why does A7 sound bluesy?
The flattened 7th G sits a whole step below the root, and its clash with the major 3rd C# creates the tension the blues is built on. That tritone-like pull is the sound of the dominant 7th. On the piano, the keys above put that note under your fingers.
Which chord does A7 resolve to?
Most often it resolves to the tonic a perfect fourth above A — the I chord of the key where A7 is the V7. In the blues it can also stay put for a whole bar, which is part of the style. On the piano, the keys above put that note under your fingers.