interval
D♯ major second
D♯lowerE♯upperM22 half steps
A whole step. The distance between most neighbouring notes of a major scale.
On the keyboard
What is true of it
D♯ up a major second is E♯: 2 half steps, and 2 letters counting both ends.
Turn it upside down — put the D♯ on top — and it becomes a minor seventh. 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♯ → 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♯minor seventh · dissonanceD♯ → C𝄪major seventh · dissonance