To play Asus4 on the bass, you need the notes A, D, E. On bass it is outlined with the arpeggio A, E, A, D — root, 5th, root, 3rd. This guide covers the suspended 4th chord in full: what is in it, how to play it cleanly on the bass, where it fits musically and how to practise it.
What notes are in the Asus4 chord?
The Asus4 chord is a suspended 4th chord, and its notes are fixed: A, D, E. 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 Asus4 at a glance. On the bass, Asus4 is the arpeggio A, E, A, D — root, 5th, root, 3rd — and that order is the shape to learn.
| Note | Interval |
|---|---|
| A | Root |
| D | 4 |
| E | 5 |
The root is A, the note the chord is named after and the note your ear hears as home. Above it, the intervals in Asus4 are 4, 5. Those intervals are the fingerprint of the suspended 4th quality — any chord with the same interval pattern, on any root, is the same kind of chord. On the bass, the notes appear in the order the fingering dictates, but the set of notes never changes.
Asus4 sounds open but restless, the classic suspended sound that every listener recognises as unfinished business. That character comes straight from the intervals above, not from the instrument: the same notes on piano, guitar or ukulele carry the same colour, even though the voicing changes. On the bass, play A, E, A, D and hear how the arpeggio spells out Asus4 without ever playing it as a block.
Comparing Asus4 with its closest relatives helps to fix it in your ear. In short, sus4 against sus2: Asus4 uses the 4th D where the sus2 uses the 2nd B. The sus4 is tenser and its resolution to the 3rd is more dramatic. Hearing the comparison matters more than reading it: play Asus4, then play the chord it is compared with above, and let your ear find the note that changed. On the bass, Asus4 is the arpeggio A, E, A, D — root, 5th, root, 3rd — and that order is the shape to learn.
How to play Asus4 on bass
On the bass, Asus4 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, D, which are the chord tones of Asus4 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 Asus4 by playing A on beat one, E on beat two, A on beat three and D on beat four, one note per beat, letting each note ring for its full value. Then play it backwards — D, 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 D colour the bar without pulling attention away from the root.
Once the straight arpeggio of Asus4 is comfortable, try playing just the root A and the 5th E for a whole bar, then add the 3rd D on the last beat as a passing colour. That root-and-5th skeleton is how most bass lines outline Asus4 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 Asus4 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.
Playing the arpeggio as a chord. Strumming all the notes of Asus4 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, D and hear how the arpeggio spells out Asus4 without ever playing it as a block.
Never resolving the 4th. The 4th D wants to fall to C#. If you sit on the sus4 forever the chord sounds stuck. Practise the sus4-to-major move until the resolution feels natural. On the bass, Asus4 is the arpeggio A, E, A, D — root, 5th, root, 3rd — and that order is the shape to learn.
Resolving to the wrong 3rd. The sus4 resolves to the major 3rd C#, not the minor 3rd. Resolve to C and you have changed key, not resolved. On the bass, play A, E, A, D and hear how the arpeggio spells out Asus4 without ever playing it as a block.
Playing the 3rd as well. If C# sounds together with D the chord clashes badly. The 3rd must be absent while the 4th is present. On the bass, play A, E, A, D and hear how the arpeggio spells out Asus4 without ever playing it as a block.
Where Asus4 is used
Asus4 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 chord before the resolution — sus4 to major is one of the most used moves in all music. 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 Asus4 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, D outlines Asus4 one note at a time.
Because Asus4 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 Asus4 in a progression in any key and hear how it connects to the chords around it. On the bass, play A, E, A, D and hear how the arpeggio spells out Asus4 without ever playing it as a block.
The same chord on other instruments is covered in Asus4 on guitar, Asus4 on piano, Asus4 on ukulele, and the scales that fit over it are the A major scale and the A minor pentatonic scale. Learning Asus4 on the bass and then checking it on another instrument is one of the best ways to fix the notes — A, D, E — in your memory, because the notes stay the same while everything else changes.
Practising Asus4
A short worked example makes Asus4 concrete. Play the four-chord progression D – A – Bm – G in D major, the key Asus4 most often resolves toward: D – A – Bm – G. Play each chord for one bar at a slow tempo, and listen to how Asus4 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 Asus4 itself, and notice how its character changes when it opens the progression instead of sitting inside it. On the bass, play A, E, A, D and hear how the arpeggio spells out Asus4 without ever playing it as a block.
For a second exercise, play Asus4 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 Asus4 is built for when it acts as a dominant. Finish by playing Asus4 on its own, slowly, and naming each note out loud as you play it: A, D, E. 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, the arpeggio A, E, A, D outlines Asus4 one note at a time.
Frequently asked questions
How do you play Asus4 on the bass?
Outline it with the arpeggio A, E, A, D: 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 Asus4 at once.
What notes are in the Asus4 bass arpeggio?
The arpeggio is A, E, A, D. It starts on the root A, moves to the 5th E, returns to the root A and finishes on the 3rd D. Those four notes are the chord tones of Asus4, and playing them in that order is the standard way to outline the chord on bass.
Should you play the full Asus4 chord on bass?
Usually not. On bass the chord is outlined with the arpeggio A, E, A, D, not strummed as a block. Playing all the notes at once sounds muddy in the low register and hides the root, which is the note the rest of the band is listening for.
What does sus4 mean in Asus4?
Sus4 means the 3rd of the chord is suspended — replaced by the 4th, D. Asus4 contains A, D, E, and the 4th is the note that makes it sound tense and unresolved. On the bass, the arpeggio above shows where that note sits.
How do you resolve Asus4?
Let the 4th D fall by a semitone to the major 3rd C#. That one-step move, sus4 to major, is the classic resolution and the sound every listener expects. On the bass, the arpeggio above shows where that note sits.