The Rule of Threes is much more common than we are consciously aware. Most stories we encounter in books, television, film, and theatre use a three-act structure of scenario, complication, resolution. The Rule of Three is also prevalent in advertising and oratory: Life, Liberty, and the Pursuit of Happiness; Liberté, égalité, fraternité; Snap, Crackle, and Pop.
It can also be claimed as a foundation of music: a chord by another name is a triad, which is three notes; musical function is categorized as either melodic, harmonic, or rhythmic; Sonata Form, the basis for most symphonies, is a home-away-home structure. Even