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How to play a Cdim chord on Accordion

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

AKA: C diminished seventh, C°, Cdim, Cdim7, Cdim7th, Cdim/6, Cdim(add6)

Green bass pattern: Cdim7(omit5) = Cm6(omit5)

Blue counter bass pattern: Cdim7

Cdim Accordion chord chart

C dim notation

Notes:

C, E♭, G♭, B♭♭
(C, E♭, G♭, A)

Cdim button plays:
C, E♭, B♭♭ (no G♭)

Intervals:

R, m3°, m5°, dim7°

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

Left hand:

Green bass pattern:
Cdim7(omit5), same as Cm6(omit5)

C + Cdim

Blue counter bass pattern: Cdim7

C + G♭dim
(B# + F#dim)

Fingering:

4 + 2

 

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