Bb Diminished Triad

Chord Tones: Bb 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 Bb diminished chord commonly functions as the subtonic (♭VII) in C major or subdominant in F 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.

Common Progressions

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

• vii°-I
• ii°-V

Songs Featuring the Diminished Triad

Well-known songs where the Bb 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 Bb Diminished Triad

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