B Diminished

Fretboard

About

The B diminished triad (B–D–F) stacks two minor thirds, producing a tense, unstable sound. The instability comes from the tritone between root and ♭5 — an interval the ear strongly wants to resolve. It most often appears as the vii° chord in a major key, functioning as a leading-tone chord that resolves up a half step to the tonic; here B° → C. All three tones — root, D, F — are structurally important, since removing any one collapses the chord’s identity. Because its shape repeats every three frets (the symmetrical construction), diminished shapes are unusually portable across the neck. Compared to Bm, the flattened fifth creates a much more directed pull toward resolution.

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