interval
G♯ major seventh
G♯lowerF𝄪upperM711 half steps
Eleven half steps: a half step short of the octave, which is why it leans on it.
On the keyboard
What is true of it
G♯ up a major seventh is F𝄪: 11 half steps, and 7 letters counting both ends.
Turn it upside down — put the G♯ on top — and it becomes a minor second. The two numbers always add to nine, and the two sizes to twelve.
It is a dissonance.
Every interval on G♯
G♯ → Aminor second · dissonanceG♯ → A♯major second · dissonanceG♯ → Bminor third · imperfect consonanceG♯ → B♯major third · imperfect consonanceG♯ → C♯perfect fourth · perfect consonanceG♯ → C𝄪augmented fourth · dissonanceG♯ → Ddiminished fifth · dissonanceG♯ → D♯perfect fifth · perfect consonanceG♯ → Eminor sixth · imperfect consonanceG♯ → E♯major sixth · imperfect consonanceG♯ → F♯minor seventh · dissonance