Fig. 1 · Db to Bbb

interval

D♭ minor sixth

D♭lowerB♭♭upperm68 half steps

Eight half steps. The major third turned upside down.

On the keyboard

Fig. 2

What is true of it

D♭ up a minor sixth is B♭♭: 8 half steps, and 6 letters counting both ends.

Turn it upside down — put the D♭ on top — and it becomes a major third. The two numbers always add to nine, and the two sizes to twelve.

It is a imperfect consonance.

Every interval on D♭

D♭ → E♭♭minor second · dissonance D♭ → E♭major second · dissonance D♭ → F♭minor third · imperfect consonance D♭ → Fmajor third · imperfect consonance D♭ → G♭perfect fourth · perfect consonance D♭ → Gaugmented fourth · dissonance D♭ → A♭♭diminished fifth · dissonance D♭ → A♭perfect fifth · perfect consonance D♭ → B♭major sixth · imperfect consonance D♭ → C♭minor seventh · dissonance D♭ → Cmajor seventh · dissonance

C m6 D m6 D♯ m6 E♭ m6 E m6 F m6 F♯ m6 G♭ m6 all 204