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♭ → E♭♭minor second · dissonanceD♭ → F♭minor third · imperfect consonanceD♭ → Fmajor third · imperfect consonanceD♭ → G♭perfect fourth · perfect consonanceD♭ → Gaugmented fourth · dissonanceD♭ → A♭♭diminished fifth · dissonanceD♭ → A♭perfect fifth · perfect consonanceD♭ → B♭♭minor sixth · imperfect consonanceD♭ → B♭major sixth · imperfect consonanceD♭ → C♭minor seventh · dissonanceD♭ → Cmajor seventh · dissonance