Chord
B♭dim7 is a diminished seventh chord with the notes B♭, D♭, F♭, A𝄫. Also written B♭°7. The same chord spelled from A♯ is A♯dim7.
| Note | Interval | Semitones |
|---|---|---|
| B♭ | root | 0 |
| D♭ | minor 3rd | 3 |
| F♭ | diminished 5th | 6 |
| A𝄫 | diminished 7th | 9 |
| Root position | B♭ – D♭ – F♭ – A𝄫 | |
| 1st inversion | D♭ – F♭ – A𝄫 – B♭ (B♭dim7/D♭) | |
| 2nd inversion | F♭ – A𝄫 – B♭ – D♭ (B♭dim7/F♭) | |
| 3rd inversion | A𝄫 – B♭ – D♭ – F♭ (B♭dim7/A𝄫) |
A diminished seventh chord stacks three minor 3rds. It divides the octave into four equal parts, so the same four notes form diminished chords on four different roots; it often replaces a dominant chord.
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