The A7 bass chord is a dominant 7th chord with the notes A, C#, E, G. On bass it is outlined with the arpeggio A, E, A, C# — root, 5th, root, 3rd. Whether you are learning it for the first time or checking a voicing, this page has the notes, the bass 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 bass, the arpeggio A, E, A, C# outlines A7 one note at a time.
| 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 bass, 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 bass, the arpeggio A, E, A, C# outlines A7 one note at a time.
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 bass, play A, E, A, C# and hear how the arpeggio spells out A7 without ever playing it as a block.
How to play A7 on bass
On the bass, A7 is not played as a full chord shape the way it is on guitar or piano. Instead you outline it with an arpeggio: the notes A, E, A, C#, which are the chord tones of A7 in the order root, 5th, root, 3rd. That pattern is the working shape for this chord on bass, and it tells the listener exactly which chord is sounding, even though you never play all the notes at once.
Practise the arpeggio of A7 by playing A on beat one, E on beat two, A on beat three and C# on beat four, one note per beat, letting each note ring for its full value. Then play it backwards — C#, A, E, A — so your fingers learn the shape in both directions. The root A is the anchor: it is the note the rest of the band listens for, so land on it cleanly and on time, and let the 5th E and the 3rd C# colour the bar without pulling attention away from the root.
Once the straight arpeggio of A7 is comfortable, try playing just the root A and the 5th E for a whole bar, then add the 3rd C# on the last beat as a passing colour. That root-and-5th skeleton is how most bass lines outline A7 in a real song, and the full arpeggio is the version you use when the arrangement has space for it. Check the notes with the Bass Chord Finder and the Chord Finder, and practise the arpeggio against a slow metronome so the notes land exactly on the beat.
Common mistakes
These are the mistakes that most often make A7 sound wrong on the bass, and each one has a concrete fix. Work through them one at a time rather than trying to fix everything at once.
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 bass, play A, E, A, C# and hear how the arpeggio spells out A7 without ever playing it as a block.
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 bass, the arpeggio A, E, A, C# outlines A7 one note at a time.
Muddy low voicings. The flattened 7th low down can sound muddy. Try a higher voicing or drop the 5th, which is the least important note in a dominant 7th chord. On the bass, the arpeggio A, E, A, C# outlines A7 one note at a time.
Playing the arpeggio as a chord. Strumming all the notes of A7 at once on bass sounds muddy and hides the root. Play the arpeggio one note at a time, let each note ring, and keep the root A as the note the listener hears first. On the bass, play A, E, A, C# and hear how the arpeggio spells out A7 without ever playing it as a block.
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. the V7 chord, the dominant, whose job is to push a progression home to the tonic. 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 bass, the arpeggio A, E, A, C# outlines A7 one note at a time.
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 bass, the arpeggio A, E, A, C# outlines A7 one note at a time.
The same chord on other instruments is covered in A7 on guitar, A7 on piano, A7 on ukulele, and the scales that fit over it are the A major scale and the A minor pentatonic scale. Learning A7 on the bass 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 bass, the arpeggio A, E, A, C# outlines A7 one note at a time.
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 bass, A7 is the arpeggio A, E, A, C# — root, 5th, root, 3rd — and that order is the shape to learn.
Frequently asked questions
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 bass, the arpeggio above spells that note out one note at a time.
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 bass, the arpeggio above spells that note out one note at a time.
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 bass, the arpeggio above spells that note out one note at a time.
How do you play A7 on the bass?
Outline it with the arpeggio A, E, A, C#: root, 5th, root, 3rd. Play one note per beat, with the root A on beat one, and let each note ring. That arpeggio tells the listener exactly which chord is sounding, even though you never play all the notes of A7 at once.
What notes are in the A7 bass arpeggio?
The arpeggio is A, E, A, C#. It starts on the root A, moves to the 5th E, returns to the root A and finishes on the 3rd C#. Those four notes are the chord tones of A7, and playing them in that order is the standard way to outline the chord on bass.