interval
A♯ minor sixth
A♯lowerF♯upperm68 half steps
Eight half steps. The major third turned upside down.
On the keyboard
What is true of it
A♯ up a minor sixth is F♯: 8 half steps, and 6 letters counting both ends.
Turn it upside down — put the A♯ 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 A♯
A♯ → Bminor second · dissonanceA♯ → B♯major second · dissonanceA♯ → C♯minor third · imperfect consonanceA♯ → C𝄪major third · imperfect consonanceA♯ → D♯perfect fourth · perfect consonanceA♯ → D𝄪augmented fourth · dissonanceA♯ → Ediminished fifth · dissonanceA♯ → E♯perfect fifth · perfect consonanceA♯ → F𝄪major sixth · imperfect consonanceA♯ → G♯minor seventh · dissonanceA♯ → G𝄪major seventh · dissonance