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How to play a Bbdim chord on Accordion

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

AKA: Bb diminished seventh, Bb°, Bbdim, Bbdim7, Bbdim7th, Bbdim/6, Bbdim(add6)

Green bass pattern: Bbdim7(omit5) = Bbm6(omit5)

Blue counter bass pattern: Bbdim7

Bbdim Accordion chord chart

Bb dim notation

Notes:

B♭, D♭, F♭, A♭♭
(B♭, D♭, E, G)

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

Intervals:

R, m3°, dim5°, dim7°

Dim buttons play:
R, m3°, dim7° (no dim5°)

Left hand:

Green bass pattern:
Bbdim7(omit5), same as Bbm6(omit5)

B♭ + B♭dim
(A# + A#dim)

Blue counter bass pattern: Bbdim7

B♭ + F♭dim
(A# + Edim)

Fingering:

4 + 2

 

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