A Minor 7th, Flat 5th Mandolin Chord

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

make a barre on the fifth fret with your first finger from the first string to the fourth string
your second finger goes on the sixth fret of the second string

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

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

Root : A

Minor 3rd : C

Diminished 5th : D#

Minor 7th : G

Am7♭5/C

Diagram of an A minor 7th, flat 5th mandolin chord at the 1 fret

Am7♭5

Diagram of an A minor 7th, flat 5th mandolin chord at the 10 fret (third inversion)

Am7♭5/G

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

Am7♭5/D#

Diagram of an A minor 7th, flat 5th mandolin chord at the 12 fret (third inversion)

Am7♭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."