A#sus4 Suspendu 4 Accord

The A# Suspendu 4 chord contains: A#, D#, F.

These notes are derived by applying the suspended 4th interval formula (0–5–7 semitones) to the root note A#.

Replaces the third with a perfect fourth.

Classic rock tension before resolution. The A#sus4 chord is used across pop, rock, jazz, and classical music. As the I chord in the key of A# major, it functions as the most stable resting point in progressions.

On piano, play A#, D#, F simultaneously.

In root position, A# is the lowest note. Inversions move the bass note up — first inversion has D# lowest, second inversion has F lowest.

A suspended 4th chord has 3 notes: A#, D#, F (in A#).

It is a triad — the most fundamental chord type.

The A# major chord (A#–D–F) uses a major third (4 semitones), giving it a bright, happy sound.

The A# minor chord (A#–C#–F) uses a minor third (3 semitones), giving it a darker, emotional sound.

A#sus4 naturally serves as the I chord in the key of A# major.

It also appears as IV in the key of F major, and as V in the key of D# major.

Yes.

The ukulele uses GCEA tuning with 4 strings. The A#sus4 chord notes (A#, D#, F) can be fretted on a ukulele, though the shapes differ from guitar due to the 4-string layout and shorter scale.

In the key of A# major, A#sus4 pairs naturally with D# major (IV), F major (V), and Gm (vi).

The classic I–IV–V (A#sus4–D#–F) is the foundation of blues, country, and rock.

An inversion places a non-root note in the bass.

A#sus4 root position: A# in bass. First inversion: D# in bass. Second inversion: F in bass. Inversions create smoother bass line movement without changing the harmony.

Remember the formula: 0–5–7 semitones from root.

For A#sus4: start on A#, add 5 semitones, then 7 semitones. Practicing this across all 12 roots builds instant recognition of any suspended 4th chord.