A♭ Minor 7th, Flat 5th Mandolin Chord

also known as A♭ half-diminished 7th, A♭ half-diminished

Notes in an A♭ Minor 7th, Flat 5th Mandolin chord

Root : A♭

Minor 3rd : B

Diminished 5th : D

Minor 7th : G♭

A♭m7♭5

Diagram of an A♭ minor 7th, flat 5th mandolin barre chord at the 4 fret (first inversion)

A♭m7♭5/B

Diagram of an A♭ minor 7th, flat 5th mandolin chord at the 9 fret (third inversion)

A♭m7♭5/G♭

Diagram of an A♭ minor 7th, flat 5th mandolin chord at the 12 fret

A♭m7♭5

Diagram of an A♭ minor 7th, flat 5th mandolin chord at the 6 fret (second inversion)

A♭m7♭5/D

Diagram of an A♭ minor 7th, flat 5th mandolin chord at the 11 fret (third inversion)

A♭m7♭5/G♭

Half-diminished seventh chord

In music theory, the half-diminished seventh chord (also known as a half-diminished chord or a minor seventh flat five chord) is a seventh chord composed of a root note, together with a minor third, a diminished fifth, and a minor seventh. In diatonic harmony, the half-diminished seventh chord occurs naturally on the seventh scale degree of any major scale (for example, Bø7 in C major) and is thus a leading-tone seventh chord in the major mode. Similarly, the chord also occurs on the second degree of any natural minor scale. It has been described as a "considerable instability."