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Guitar Chord Bdim: Structure, Notes and Theory

Bdim — a chord built on the note “B” with a tense, sharp tone that adds drama. Often used as a passing chord to boost expressiveness and create intrigue.

To view possible positions and quickly find the most comfortable chord shape, use the interactive fretboard. You can change the guitar tuning, fretboard orientation, and finger display. Detailed instructions on how to use and customize the tool can be found on the main chord navigator page — make the most of it for your convenience.

Bdim — Position 1 of 6
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Formula and Structure of the Bdim Chord

Interval formula from the root note: 1 — b3 — b5. The chord consists of the following notes:

  • B — unison and the main tonal anchor.
  • D — minor third with a melancholic character and gentle lyricism.
  • F — diminished fifth with tritone tension, best used cautiously in the bass.

Together, these notes form the harmonic foundation of the Bdim chord, defining its sound and role in the musical context.

Alternative Names for the Bdim Chord

This chord may appear under different names:

  • B°

All variants refer to the same harmonic structure.

Using the Bdim Chord

Put the b5 in the middle or top register to avoid overloading the bass. Use as a link between diatonic chords or to create dramatic moments. In slow tempos, you can highlight its symmetrical structure.

Conclusion

Bdim is an expressive and versatile chord. Learn several fingerings, experiment with different positions and voice spacing, then try weaving it into your own playing — this will help you quickly find your unique tone.

Bdim — structure, notes, and formula (1 — b3 — b5). Brief theory, usage, and fretboard positions.

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