SAMPLED

Music theory basics · updated 2026-08-16

CHORD AND TRIAD

Three or more pitches sounding together. A triad stacks a root, a third and a fifth; add a seventh and you get the jazz and neo-soul colours.

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

  • Three or more pitches sounding together.
  • A triad stacks a root, a third and a fifth; add a seventh and you get the jazz and neo-soul colours.
  • The third decides major or minor, the fifth decides stability (flatten it and you get diminished, raise it and you get augmented), and adding a seventh or ninth adds the colour associated with jazz, R&B and neo-soul.
  • C–E–G is a C major triad.
  • Watch out: voicing every chord as a compact triad in the same octave.

Quick checklist

  • Can you define chord and triad in one sentence without looking?
  • Can you point at chord and triad 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 AND TRIAD IN DEPTH

A triad is the smallest chord that fully implies a harmony: root, third and fifth. The third decides major or minor, the fifth decides stability (flatten it and you get diminished, raise it and you get augmented), and adding a seventh or ninth adds the colour associated with jazz, R&B and neo-soul.

How it works in practice

C–E–G is a C major triad. Change the E to E♭ and you have C minor without touching the other two notes.

The mistake people make

Voicing every chord as a compact triad in the same octave. Stacked low thirds turn to mud below roughly 200 Hz — spread them out or drop the third from the bass register.

WHERE CHORD AND TRIAD SITS

Chord and triad 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.

TERMS THAT DEPEND ON CHORD AND TRIAD

  • 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.

  • Semitone and whole tone

    The semitone is the smallest step in Western equal temperament; two semitones make a whole tone. Everything from scales to chord spelling is counted in them.

  • Voice leading

    How individual lines move between chords. Smooth voice leading keeps common tones and moves the rest by the smallest step available.

  • Inversion

    A chord voiced with something other than the root in the bass. First inversion puts the third at the bottom, second inversion the fifth.

  • Arpeggiator

    A sequencer that plays a held chord one note at a time in a pattern, locked to tempo. Rate, order and octave range are the usual controls.

TEST YOURSELF

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

  1. 1. Which statement best describes chord and triad?

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

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

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

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

    Free interactive lessons · musictheory.net

    “Three or more pitches sounding together.”— the claim this source supports

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

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

    Open textbook · Open Music Theory

    “A triad stacks a root, a third and a fifth; add a seventh and you get the jazz and neo-soul colours.”— the claim this source supports

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

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