interval
A♭ minor seventh
A♭lowerG♭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
A♭ up a minor seventh is G♭: 10 half steps, and 7 letters counting both ends.
Turn it upside down — put the A♭ 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 A♭
A♭ → B♭♭minor second · dissonanceA♭ → B♭major second · dissonanceA♭ → C♭minor third · imperfect consonanceA♭ → Cmajor third · imperfect consonanceA♭ → D♭perfect fourth · perfect consonanceA♭ → Daugmented fourth · dissonanceA♭ → E♭♭diminished fifth · dissonanceA♭ → E♭perfect fifth · perfect consonanceA♭ → F♭minor sixth · imperfect consonanceA♭ → Fmajor sixth · imperfect consonanceA♭ → Gmajor seventh · dissonance