American chamber music society

One other interesting thing about the I-IV-V progression is that, within the chord tones of this progression, it collectively outlines the entire major scale. Remember, the I chord is D, made up of the notes D, F♯, and A; the V chord is A, made up of the notes A, C♯, and E; and the IV chord is G, made up of the notes G, B, and D.

I often wonder what would happen if we bring back more of this kind of multilayered, allegorical thinking, this juicy stuff that made the music of Bach and others so meaningful in its day? Reviving these older creative methods and conceptions of music makes a worthy and profound experiment.