A#m7b5 Halbvermindert Akkord

The A# Halbvermindert chord contains: A#, C#, E, G#.

These notes are derived by applying the half-diminished 7th interval formula (0–3–6–10 semitones) to the root note A#.

Diminished triad with a minor seventh.

Common in jazz as the ii chord in minor keys. The A#m7b5 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#, C#, E, G# simultaneously.

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

A half-diminished 7th chord has 4 notes: A#, C#, E, G# (in A#).

It is a 7th chord, extending beyond the basic triad.

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#m7b5 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#m7b5 chord notes (A#, C#, E, G#) 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#m7b5 pairs naturally with D# major (IV), F major (V), and Gm (vi).

The classic I–IV–V (A#m7b5–D#–F) is the foundation of blues, country, and rock.

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

A#m7b5 root position: A# in bass. First inversion: C# in bass. Second inversion: E in bass. Inversions create smoother bass line movement without changing the harmony.

Remember the formula: 0–3–6–10 semitones from root.

For A#m7b5: start on A#, add 3 semitones, then 6 semitones, then 10 semitones. Practicing this across all 12 roots builds instant recognition of any half-diminished 7th chord.