interval
C♯ minor sixth
C♯lowerAupperm68 half steps
Eight half steps. The major third turned upside down.
On the keyboard
What is true of it
C♯ up a minor sixth is A: 8 half steps, and 6 letters counting both ends.
Turn it upside down — put the C♯ 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 C♯
C♯ → Dminor second · dissonanceC♯ → D♯major second · dissonanceC♯ → Eminor third · imperfect consonanceC♯ → E♯major third · imperfect consonanceC♯ → F♯perfect fourth · perfect consonanceC♯ → F𝄪augmented fourth · dissonanceC♯ → Gdiminished fifth · dissonanceC♯ → G♯perfect fifth · perfect consonanceC♯ → A♯major sixth · imperfect consonanceC♯ → Bminor seventh · dissonanceC♯ → B♯major seventh · dissonance