SAMPLED

Music theory basics · updated 2026-08-16

OVERTONE SERIES

Almost every pitched sound contains a fundamental plus quieter harmonics above it. Their relative levels are most of what we call timbre.

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

  • Almost every pitched sound contains a fundamental plus quieter harmonics above it.
  • Their relative levels are most of what we call timbre.
  • Their relative levels are most of what you hear as timbre, and the series explains why octaves, fifths and thirds are consonant — they are already present in the sound.
  • Rolling off the top harmonics of a bright saw wave with a low-pass filter turns it toward a hollow, flute-like tone without changing the pitch.
  • Watch out: boosting a fundamental to make a bass louder on small speakers.

Quick checklist

  • Can you define overtone series in one sentence without looking?
  • Can you point at overtone series 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?

OVERTONE SERIES IN DEPTH

Almost every pitched sound contains a fundamental plus a stack of harmonics at whole-number multiples of it. Their relative levels are most of what you hear as timbre, and the series explains why octaves, fifths and thirds are consonant — they are already present in the sound.

How it works in practice

Rolling off the top harmonics of a bright saw wave with a low-pass filter turns it toward a hollow, flute-like tone without changing the pitch.

The mistake people make

Boosting a fundamental to make a bass louder on small speakers. Phones and laptops reproduce the harmonics, not the fundamental, so the harmonics are what carry perceived pitch.

WHERE OVERTONE SERIES SITS

Overtone series 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 overtone series. Answers are marked instantly — nothing is sent anywhere.

  1. 1. Which statement best describes overtone series?

  2. 2. What is the mistake people most often make with overtone series?

  3. 3. In practice, which of these applies to overtone series?

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 overtone series — standards bodies, manufacturers, government offices and university course material. Each one lists the line of this entry it backs up.

  • Stanford CCRMA — spectral audio (opens in a new tab)

    University research centre · Stanford CCRMA

    “Almost every pitched sound contains a fundamental plus quieter harmonics above it.”— the claim this source supports

    Why it counts: The CCRMA course material derives this from first principles, so you can check the maths behind the plain-English version above.

  • Xiph.org — digital show and tell (opens in a new tab)

    Open-source standards group · Xiph.Org Foundation

    “Their relative levels are most of what we call timbre.”— the claim this source supports

    Why it counts: Xiph's write-ups are free, technically rigorous and famously careful about the myths around digital audio.

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