The A7b5 piano chord is built from the notes A, C#, D#, G. On piano it is played from the keys A, C#, D#, G, root position first, then in inversions. It is a 7th flat 5th chord, and this page gives you its exact notes, the fingerings that work on the piano, the mistakes to avoid and the progressions it appears in.
What notes are in the A7b5 chord?
The A7b5 chord is a 7th flat 5th chord, and its notes are fixed: A, C#, D#, 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 A7b5 at a glance. On the piano, A7b5 is the keys A, C#, D#, G, and the inversions above move the same notes around.
| Note | Interval |
|---|---|
| A | Root |
| C# | 3 |
| D# | b5 |
| 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 A7b5 are 3, b5, b7. Once you know the intervals, you can build A7b5 from any root by counting the same semitone steps, which is how the chord works in every key. On the piano, the notes appear in the order the fingering dictates, but the set of notes never changes.
A7b5 sounds restless and altered, the sound of a dominant chord that has been bent out of shape on purpose. Listen for that character when you play it — if A7b5 does not sound that way, one of the notes is probably wrong, and the table above is the place to check. On the piano, play the keys A, C#, D#, G slowly and listen for each note of A7b5 in turn.
Comparing A7b5 with its closest relatives helps to fix it in your ear. In short, 7b5 against dominant 7th: A7b5 flattens the 5th to D# where the plain dominant 7th keeps the perfect 5th E. That one change adds a whole new layer of tension. Play both chords slowly, one after the other, and notice which note moves. Naming that note out loud while you play is the fastest way to learn the difference. On the piano, the root-position keys A, C#, D#, G show A7b5 most clearly.
How to play A7b5 on piano
On the piano, A7b5 is played from the keys A, C#, D#, G. In root position the lowest note is A, the root, with the other notes stacked above it in the order A, C#, D#, G. Play it with the right hand first, then with the left hand an octave lower, so both hands know the shape of A7b5 before you try it in a progression.
First inversion of A7b5 puts C# in the bass, with the notes in the order C#, D#, G, A. The chord is still A7b5 — 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 A7b5 puts D# in the bass, with the notes in the order D#, G, A, C#. The chord is still A7b5 — 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 D# 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 A7b5 puts G in the bass, with the notes in the order G, A, C#, D#. The chord is still A7b5 — 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 A7b5 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#, D# — let your longer fingers take it, since they reach the black keys more easily. Practise A7b5 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 A7b5 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.
Using it as a tonic. A7b5 is a dominant chord, and an altered one at that. It wants to resolve, usually to the tonic a fourth above its root. On the piano, the root-position keys A, C#, D#, G show A7b5 most clearly.
Voicing it too low. The flattened 5th low down can sound muddy against the root. Keep D# in a higher octave. On the piano, play the keys A, C#, D#, G slowly and listen for each note of A7b5 in turn.
Overusing altered dominants. A run of altered chords loses its effect. Use A7b5 where the tension earns its place — before a resolution. On the piano, play the keys A, C#, D#, G slowly and listen for each note of A7b5 in turn.
Playing every inversion with the same hand shape. Each inversion of A7b5 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 A7b5 separately, hands apart, before you join them. On the piano, play the keys A, C#, D#, G slowly and listen for each note of A7b5 in turn.
Where A7b5 is used
A7b5 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. an altered dominant in jazz, where the flattened 5th adds tension before a resolution. 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 A7b5 does its work: not as a home chord, but as a chord that creates movement and then resolves. On the piano, the root-position keys A, C#, D#, G show A7b5 most clearly.
Because A7b5 is an extended or altered chord, it appears in progressions as a colour or a dominant rather than as a diatonic staple. Try it in place of the plain A triad in a progression you already know, and listen to how the extra notes change the feel — that substitution is the usual way extended chords enter real music. The Chord Progression Builder lets you try A7b5 in a progression in any key and hear how it connects to the chords around it. On the piano, A7b5 is the keys A, C#, D#, G, and the inversions above move the same notes around.
The same chord on other instruments is covered in A7b5 on guitar, A7b5 on ukulele, A7b5 on bass, and the scales that fit over it are the A major scale and the A minor pentatonic scale. Learning A7b5 on the piano and then checking it on another instrument is one of the best ways to fix the notes — A, C#, D#, G — in your memory, because the notes stay the same while everything else changes.
Practising A7b5
A short worked example makes A7b5 concrete. Play the four-chord progression D – A – Bm – G in D major, the key A7b5 most often resolves toward: D – A – Bm – G. Play each chord for one bar at a slow tempo, and listen to how A7b5 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 A7b5 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#, D#, G slowly and listen for each note of A7b5 in turn.
For a second exercise, play A7b5 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 A7b5 is built for when it acts as a dominant. Finish by playing A7b5 on its own, slowly, and naming each note out loud as you play it: A, C#, D#, 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, the root-position keys A, C#, D#, G show A7b5 most clearly.
Frequently asked questions
Where is A7b5 used?
A7b5 is an altered V chord in jazz, used before a resolution to the tonic, and as a tritone substitute for the dominant a tritone away. On the piano, the keys above put that note under your fingers.
How do you play A7b5 on the piano?
In root position, play the keys A, C#, D#, G, with A as the lowest note. That is the basic shape of A7b5 on the piano. The inversions above put a different note in the bass, and the Chord Inverter shows every inversion of A7b5 on the keyboard.
What is the first inversion of A7b5?
The first inversion of A7b5 puts C# in the bass, with the notes in the order C#, D#, G, A. The chord is still A7b5 — 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 A7b5 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 A7b5 are black keys before you settle on a fingering.
What notes are in A7b5?
A7b5 contains A, C#, D#, G: root A, major 3rd C#, flattened 5th D# and flattened 7th G. The flattened 5th is the note that makes it an altered dominant. On the piano, the keys above put that note under your fingers.