The dim7 chord is formed by the intervals root (1), minor third (b3), diminished fifth (b5) and diminished seventh (bb7). In this chord thus sound the notes B♭, D♭, F♭ and A♭♭. To hear the B♭dim7, click on the chord diagram. To highlight some chords with a yellow background, click on top of the diagram. This selection can be saved by copying the link from the browser.