Fig. 1 · D# to B

interval

D♯ minor sixth

D♯lowerBupperm68 half steps

Eight half steps. The major third turned upside down.

On the keyboard

BD#
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♯ → Eminor second · dissonanceD♯ → E♯major second · dissonanceD♯ → F♯minor third · imperfect consonanceD♯ → F𝄪major third · imperfect consonanceD♯ → G♯perfect fourth · perfect consonanceD♯ → G𝄪augmented fourth · dissonanceD♯ → Adiminished fifth · dissonanceD♯ → A♯perfect fifth · perfect consonanceD♯ → B♯major sixth · imperfect consonanceD♯ → C♯minor seventh · dissonanceD♯ → C𝄪major seventh · dissonance

C m6C♯ m6D♭ m6D m6E m6F m6F♯ m6G♭ m6all 204