A#maj9 Major 9th Chord

The A# Major 9th chord contains: A#, D, F, A, C.

These notes are derived by applying the major 9th interval formula (0–4–7–11–14 semitones) to the root note A#.

Major 7th with added 9th.

Lush, dreamy sound used in jazz and ambient music. The A#maj9 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, A, C 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 major 9th chord has 5 notes: A#, D, F, A, C (in A#).

It is an extended chord with 5 or more notes.

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#maj9 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#maj9 chord notes (A#, D, F, A, C) 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#maj9 pairs naturally with D# major (IV), F major (V), and Gm (vi).

The classic I–IV–V (A#maj9–D#–F) is the foundation of blues, country, and rock.

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

A#maj9 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: 0–4–7–11–14 semitones from root.

For A#maj9: start on A#, add 4 semitones, then 7 semitones, then 11 semitones, then 14 semitones. Practicing this across all 12 roots builds instant recognition of any major 9th chord.