How to play a G7b9 chord on Accordion

AKA: G7 Flat 9, G7(b9), G7/b9, G Dominant 7th b9, G Dominant Seventh Flat Nine

Notes:

G, B, D, F, A♭

Intervals:

R, 3°, 5°, m7°, m9°

Left hand:

G + Fdim

Optional:

G + G Major + Fdim

Fingering:

3 + 2 or 4 + 2

Optional: 4 + 3 + 2

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Tags:7 Flat 9 7(b9)7/b9 Dominant 7th b9 Dominant Seventh Flat Nine

The diminished chord buttons on the accordion actually are diminished 7th chords without the 5th, this means that they play just the root, the minor 3rd, and the diminished 7th. In this case, the 7th of the diminished chord is also the 5th of the major chord circled in purple.

The Major chord adds just one note to the chord (the 3rd). In my opinion, there’s no need to play the Major chord even because the fingering is quite uncomfortable. My advice is to play just the root and diminished chord.

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