Fig. 1 · F to C

interval

F perfect fifth

FlowerCupperP57 half steps

Seven half steps. Stack twelve of them and you land back where you started, give or take a comma.

On the keyboard

Fig. 2

What is true of it

F up a perfect fifth is C: 7 half steps, and 5 letters counting both ends.

Turn it upside down — put the F on top — and it becomes a perfect fourth. The two numbers always add to nine, and the two sizes to twelve.

It is a perfect consonance.

Every interval on F

F → G♭minor second · dissonance F → Gmajor second · dissonance F → A♭minor third · imperfect consonance F → Amajor third · imperfect consonance F → B♭perfect fourth · perfect consonance F → Baugmented fourth · dissonance F → C♭diminished fifth · dissonance F → D♭minor sixth · imperfect consonance F → Dmajor sixth · imperfect consonance F → E♭minor seventh · dissonance F → Emajor seventh · dissonance

C P5 C♯ P5 D♭ P5 D P5 D♯ P5 E♭ P5 E P5 F♯ P5 all 204