Fig. 1 · F to A

interval

F major third

FlowerAupperM34 half steps

Four half steps. The interval that makes a triad major.

On the keyboard

Fig. 2

What is true of it

F up a major third is A: 4 half steps, and 3 letters counting both ends.

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

It is a imperfect consonance.

Every interval on F

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

C M3 C♯ M3 D♭ M3 D M3 D♯ M3 E♭ M3 E M3 F♯ M3 all 204