B Diminished Triad

Chord Tones: B Diminished Triad

Symbol: dim, ° — Formula: 1-♭3-♭5

Chord Notation

Roman numeral (e.g. I, IV, V) and Nashville Number notation are key-dependent. See Keys pages for chord function within specific keys.

Inversions

Harmonic Function

The B diminished chord commonly functions as the leading tone (vii) in C major or dominant (V) in E major. Its harmonic role varies by key — in major keys it provides stable harmonic grounding.

The diminished triad features a flat third and flat fifth, creating a tense, unstable sound. It occurs naturally on the seventh degree of the major scale and resolves strongly to the tonic. The B Diminished Triad specifically contains 3 notes: B, D, F (formula: 1-♭3-♭5). On guitar, B-rooted chords are typically played as barre chords at the second or seventh fret, and on piano they use a comfortable mix of black and white keys. K-pop, J-pop, and modern R&B productions frequently feature B-rooted chords, chosen for how the key sits within typical vocal ranges.

Common Progressions

The B Diminished Triad frequently appears in these progression patterns (shown in Roman numeral notation relative to key):

• viidim-I
• iidim-V

Songs Featuring the Diminished Triad

Well-known songs where the B Diminished Triad — or this chord type — plays a prominent role:

• Whole Lotta Love – Led Zeppelin (bridge)
• Killing Me Softly – Roberta Flack
• Black Magic Woman – Santana

Tuning Frequencies Across Temperaments

Frequencies shown at A=440 Hz. View full temperament data for any note.

Scales Containing the B Diminished Triad

These scales include the B Diminished Triad as a diatonic or characteristic chord: