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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.

Photograph of a printed score of Mozart's Rondo alla Turca open on a music desk, showing staves, key signature and note heads — the written notation this section defines.
Music theory basics — Photograph of a printed score of Mozart's Rondo alla Turca open on a music desk, showing staves, key signature and note heads — the written notation this section defines.

Photo: Music Sheet, Mozart's Alla Turca (opens in a new tab) by Schiller12 (opens in a new tab), via Wikimedia Commons — CC BY-SA 4.0 (opens in a new tab)

Key takeaways

  • 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.
  • Analysing songs this way makes patterns transferable and makes it obvious when two references share a skeleton under very different production.
  • vi–IV–I–V in C major is Am–F–C–G.
  • Watch out: copying a chord progression and assuming that is what made the reference track work.

Quick checklist

  • Can you define chord progression in one sentence without looking?
  • Can you point at chord progression in a real session, mix or contract?
  • Have you tried the practical move above at least once?
  • Would you catch the common mistake before it costs you a take?
  • Have you opened one of the primary sources below rather than a forum thread?

CHORD PROGRESSION IN DEPTH

Progressions describe motion between chords rather than the chords themselves, which is why Roman numerals are the working notation: I–V–vi–IV is the same progression in every key. Analysing songs this way makes patterns transferable and makes it obvious when two references share a skeleton under very different production.

How it works in practice

vi–IV–I–V in C major is Am–F–C–G. Move the same numerals to F minor and the loop still works, just darker.

The mistake people make

Copying a chord progression and assuming that is what made the reference track work. Progressions are not copyrightable in isolation and are rarely the hook — arrangement and rhythm usually are.

WHERE CHORD PROGRESSION SITS

Chord progression belongs to music theory basics in the Sampled music glossary. The vocabulary you need before anyone can explain a chart, a chord chart, or a session to you.

TEST YOURSELF

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3 quick questions on chord progression. Answers are marked instantly — nothing is sent anywhere.

  1. 1. Which statement best describes chord progression?

  2. 2. What is the mistake people most often make with chord progression?

  3. 3. In practice, which of these applies to chord progression?

Ready for the full thing? Take the 25-question terminology test and get a certificate with your name and score.

SOURCES AND CITATIONS

Free, primary references for chord progression — standards bodies, manufacturers, government offices and university course material. Each one lists the line of this entry it backs up.

  • Open Music Theory — roman numerals (opens in a new tab)

    Open textbook · Open Music Theory

    “A sequence of chords over time.”— the claim this source supports

    Why it counts: An openly licensed university textbook, so the definition can be checked against a citable academic source.

  • musictheory.net — lessons (opens in a new tab)

    Free interactive lessons · musictheory.net

    “Roman numerals (I–V–vi–IV) describe it in a key-neutral way so you can move it to any key.”— the claim this source supports

    Why it counts: Short interactive drills that let you test the concept immediately rather than only read about it.

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