Rameau and the Birth of Harmonic Theory — the 1722 Turning Point

The Greatest Turning Point in Theory’s History

If, in 2500 years of music theory, we had to choose the single point where “theory became something else,” it would be 1722. That year, Jean-Philippe Rameau (1683-1764) published the Traité de l’harmonie (Treatise on Harmony).

Until then (through Article 3), the subject of music theory had been melody and counterpoint (the horizontal line). Rameau reversed this, declaring that the chord (the vertical sonority) is the subject that drives music. The notions we take for granted today — “chord,” “chord progression,” “I-IV-V” — all begin here.

Rameau — Composer and Theorist

Rameau was a leading composer of the French Baroque (the opera Hippolyte et Aricie, etc.) and at the same time a theorist who systematized music with mathematical thinking. Chords had sounded before Rameau, but he was the first to theorize “why that chord, in that order, sounds natural.”

Core 1: The Fundamental Bass (basse fondamentale)

Rameau’s greatest invention is the concept of the fundamental bass (basse fondamentale):

• a chord retains the same “root” even when inverted (its notes reordered up or down)
• e.g., do-mi-sol, mi-sol-do, and sol-do-mi are all the same chord rooted on “do”
• separately from the actual lowest sounding note (the bass), there exists an essential foundation of the chord

This let one grasp chords that look scattered on the surface at a deeper layer — “the motion of the root.” It gave a chord an “identity” (the modern chord names C / Am are exactly this).

Core 2: The Germ of Functional Harmony

From the concept of the root arises the view of the role (function) a chord fulfills:

• Tonic — stability, point of arrival
• Dominant — tension, wants to resolve to the tonic
• Subdominant — intermediate

The dynamics of progression, “the dominant resolves to the tonic,” were theorized. This would be completed as functional theory with T/S/D by Riemann in the 19th century (Article 6). “A chord has a force directed toward progression” — this dynamic view differs fundamentally from the static rules of counterpoint.

Thoroughbass — a Practical Theory of the Field

Behind Rameau’s theory lay the Baroque field practice of basso continuo / thoroughbass:

• the score writes only the bass melody and, above it, numbers (figured bass)
• the harpsichordist looks at those numbers and fills in the chords by improvisation
• “6” means first inversion, “7” means a seventh chord — an abbreviated notation

Thoroughbass was a practical habit of “treating chords with symbols,” and Rameau’s theory can be said to have grounded it theoretically. Practice (thoroughbass) came first, and theory (Rameau) gave it a system afterward — a textbook case of this series’ “descriptive theory” (see the overview).

The Meaning of the Paradigm Shift

Before and after Rameau, the “way music appears” changed:

	Before Rameau (through counterpoint)	After Rameau (harmonic theory)
Subject	melodic line (horizontal)	chord (vertical)
Each moment’s chord	a “result” of crossing lines	the “agent” of progression
Unit of analysis	motion of voices	progression/function of the root

That modern music education, popular music, and jazz are all founded on “chords” is a consequence of Rameau’s reversal. In an age when Bach was still a master of counterpoint, Rameau had prepared the way of thinking about music for the next 300 years.

From This Article to the Next

We have traced the Baroque — the birth of Rameau’s harmonic theory. But to “freely sound chords in all keys,” one more premise is needed — temperament. In just intonation, the sound becomes impure with every modulation. The next article turns to the spread of equal temperament and Bach’s conquest of all 24 keys in the Well-Tempered Clavier — the historic decision of the temperament problem.