Music theory basics · updated 2026-08-16

CHORD PROGRESSION

A sequence of chords over time. Roman numerals (I–V–vi–IV) describe it in a key-neutral way so you can move it to any key.

Close-up of handwritten sheet music and a pencil on a piano music desk

SOURCES AND CITATIONS

Free, primary references for chord progression — standards bodies, manufacturers, government offices and university course material.

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