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How to play a Bdim chord on Accordion

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

AKA: B diminished seventh, B°, Bdim, Bdim7, Bdim7th, Bdim/6, Bdim(add6)

Green bass pattern: Bdim7(omit5) = Bm6(omit5)

Blue counter bass pattern: Bdim7

Bdim Accordion chord chart

B dim notation

Notes:

B, D, F, A♭

Bdim 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:
Bdim7(omit5), same as Bm6(omit5)

B + Bdim
(C♭ + C♭dim)

Blue counter bass pattern: Bdim7

B + Fdim

Fingering:

4 + 2

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