interval
D♯ major sixth
D♯lowerB♯upperM69 half steps
Nine half steps. The minor third turned upside down.
On the keyboard
What is true of it
D♯ up a major sixth is B♯: 9 half steps, and 6 letters counting both ends.
Turn it upside down — put the D♯ on top — and it becomes a minor 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♯ → Bminor sixth · imperfect consonanceD♯ → C♯minor seventh · dissonanceD♯ → C𝄪major seventh · dissonance