Chords
Bdim7
Four notes, all tension, endlessly movable.
B D F A♭ · 1 ♭3 ♭5 ♭♭7
B1
D♭3
F♭5
A♭♭♭7
The diminished 7th is a chord of pure tension — four notes stacked in equal minor-3rd steps, so it can slide anywhere and resolve almost anywhere.
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Every voicing on the neck
The idea
A stack of minor thirds
Bdim7 is B D F A♭ — every note a minor 3rd apart. That perfect symmetry means the chord has no stable root; every note could be the bottom.
- Notes: R ♭3 ♭5 ♭♭7 = B D F A♭.
- Built from equal minor-3rd steps — fully symmetrical.
- Move the shape up three frets and it's the same chord.
Where it lives
A passing and leading chord
Diminished 7ths are connectors — a passing chord between two diatonic chords, or a leading chord that resolves up a half-step into a target.
- Use it to slide chromatically between two chords.
- Resolves strongly up a half-step (Bdim7 → C).
- One shape covers four different diminished chords.
Four equal minor thirds make a chord of pure, movable tension — the ultimate connector between two stronger chords.
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