interval
D♯ minor seventh
D♯lowerC♯upperm710 half steps
Ten half steps. The interval that sits on top of a dominant seventh chord.
On the keyboard
What is true of it
D♯ up a minor seventh is C♯: 10 half steps, and 7 letters counting both ends.
Turn it upside down — put the D♯ on top — and it becomes a major second. The two numbers always add to nine, and the two sizes to twelve.
It is a dissonance.
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♯ → B♯major sixth · imperfect consonanceD♯ → C𝄪major seventh · dissonance