Fig. 1 · Gb to Bbb

interval

G♭ minor third

G♭lowerB♭♭upperm33 half steps

Three half steps. The interval that makes a triad minor.

On the keyboard

Fig. 2

What is true of it

G♭ up a minor third is B♭♭: 3 half steps, and 3 letters counting both ends.

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

It is a imperfect consonance.

Every interval on G♭

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

C m3 C♯ m3 D♭ m3 D m3 D♯ m3 E♭ m3 E m3 F m3 all 204