What notes make up Asus4 on piano?

Spelled out, Asus4 is A, D, E — A plus the suspended 4th formula's other notes above it. In root position that's the order on the keyboard; inversions simply move a different note to the bottom of the stack.

Is Asus4 an easy chord to play on piano?

Compared to extended chords, this one is genuinely simple — fingers 1, 3, and 5 cover the whole triad in one hand. The one thing to get used to with A is that it's a white key, which most players locate by feel almost immediately.

How would a theory teacher describe Asus4's function?

As a suspension of the I or V chord in A major, built to resolve down a step into the plain triad — that's its default job. The 4th wants to fall a half or whole step to the 3rd — that resolution is the entire point of the chord.

What's the closest related chord to Asus4?

Drop the 4th down a half or whole step and Asus4 resolves into the major or minor triad on the same root — that fall is the entire musical point of a sus4.

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Asus4 Chord on Piano

Asus4 = A – D – E (Root, Perfect 4th, Perfect 5th)

A sits on the white key between the second and third black keys of the three-black-key group, and building a suspended 4th chord on top of it gives you A, D, E. The result is hanging, waiting to resolve — it functions as a suspension of the I or V chord in A major, built to resolve down a step into the plain triad. On piano, Asus4 block-style and the shape is just three notes, comfortably covered by fingers 1, 3, and 5 without any stretch; the 4th wants to fall a half or whole step to the 3rd — that resolution is the entire point of the chord. Root included, that's 3 notes total — keep that figure in mind if a written voicing ever looks like it's missing one.

Functionally, this voicing serves as a suspension of the I or V chord in A major, built to resolve down a step into the plain triad — that's the situation it shows up in most, both on the page and in improvisation. Because it fits easily under one hand, the bottleneck to playing it well isn't reach — it's repetition, so drill it alone before adding a moving bass line beneath it. First inversion puts D in the bass with A and E stacked above it, and second inversion puts E on the bottom — both are worth learning by feel, not just root position, since real progressions rarely stay in root position for long. Genre-wise it's common in church and gospel cadences and shows up again in classical suspensions written out beat by beat. A's position on the keyboard (the white key between the second and third black keys of the three-black-key group) means the whole hand can sit in a relaxed, mostly-white-key position, which is one reason this root is often taught before the black-key roots. With bass duties handled elsewhere, doubling the full triad in both hands is rarely necessary — root alone in the left hand, complete triad in the right, covers it. This triad doesn't have a fixed home register — parked near middle C it comps normally, dropped low it reads as a bass punch, and lifted high it turns airy. Most players end up recognizing Asus4 by feel and by its hanging, waiting to resolve sound well before they can name every note in it from memory.

Voicings

Root Position

First Inversion

How to Practice It

Drill the right hand alone first, fingers 1-3-5 landing on A, D, E together as one block. A being a white key keeps the hand flat and level here, so any unevenness in the sound is almost always a finger-strength issue rather than a positioning one. Add the left hand's root note only once the right hand is solid, then work both hands together at a tempo slow enough that nothing rushes. Finish by walking into Asus4 from whatever chord comes before it in context, repeating that specific transition until it's automatic. The 4th needs to actually resolve for the suspension to make musical sense — holding it indefinitely without ever moving to the 3rd defeats the point of using a sus chord at all.

Common Progressions

Asus4 resolving into A major (the classic sus-to-triad move)
Asus4 – IV – V in A major, using the suspension as a color intro
Asus4 as a held pickup chord before landing on the I chord

FAQ

What notes make up Asus4 on piano?: Spelled out, Asus4 is A, D, E — A plus the suspended 4th formula's other notes above it. In root position that's the order on the keyboard; inversions simply move a different note to the bottom of the stack.
Is Asus4 an easy chord to play on piano?: Compared to extended chords, this one is genuinely simple — fingers 1, 3, and 5 cover the whole triad in one hand. The one thing to get used to with A is that it's a white key, which most players locate by feel almost immediately.
How would a theory teacher describe Asus4's function?: As a suspension of the I or V chord in A major, built to resolve down a step into the plain triad — that's its default job. The 4th wants to fall a half or whole step to the 3rd — that resolution is the entire point of the chord.
What's the closest related chord to Asus4?: Drop the 4th down a half or whole step and Asus4 resolves into the major or minor triad on the same root — that fall is the entire musical point of a sus4.

Asus4 on other instruments: Asus4 on Guitar, Asus4 on Ukulele. Related: how chords are built, chord finder.