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How to play an Abdim chord on Accordion

On the Stradella bass system, diminished 7th chords are also minor 6th chords

AKA: Ab diminished seventh, Ab°, Abdim, Abdim7, Abdim7th, Abdim/6, Abdim(add6)

Green bass pattern: Abdim7(omit5) = Abm6(omit5)

Blue counter bass pattern: Abdim7

Abdim Accordion chord chart

Ab dim notation

Notes:

A♭, C♭, E♭♭, G♭♭
(A♭, B, D, F)

A♭dim button plays:
A♭, C♭, G♭♭ (no E♭♭)
(A♭, B, F) (no D)

Intervals:

R, m3°, m5°, dim7°

Dim buttons play:
R, m3°, dim7° (no 5°)

Left hand:

Green bass pattern:
Abdim7(omit5), same as Abm6(omit5)

A♭ + A♭dim
(G# + G#dim)

Blue counter bass pattern: Abdim7

Enharmonic G# + Ddim

Fingering:

4 + 2

 

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