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Major or minor chord: what is the difference?

A major chord and a minor chord on the same root share two of their three notes. Only the middle one, the third, changes: in minor it sits one semitone lower. That single key is the whole difference. Here is how to see it, count it and pick it out by ear.

One key makes the difference

A triad, the basic three-note chord, is made of a root (the note that names it), a third and a fifth. Build a C major chord and a C minor chord: the root C is the same, the fifth G is the same. Only the middle note moves, from E down to E♭, the black key just to its left.

Switch between the two versions and watch the darker orange key: it is the only one that changes place. The grey name shows where the other version puts it.

  • Root
  • The third, the note that changes
  • The fifth
  • The other third, for reference

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C E G. Written C, or sometimes Cmaj.

Measure the third in semitones

To compare the two thirds precisely, count semitones. A semitone is the step from one key to the very next one, black or white, with nothing in between. From C, the keys C♯, D, E♭ and E are one, two, three and four semitones up.

  • Major third: 4 semitones. C to E. This is the third of a major chord.
  • Minor third: 3 semitones. C to E♭. This is the third of a minor chord.
  • The fifth does not change: 7 semitones. C to G, in both chords.

So the two chords are mirror images. Major stacks 4 semitones then 3; minor stacks 3 then 4. The same total, a different order. The guide on building a chord uses this count to build any triad from scratch.

Another root: D and Dm

On D, the picture flips. D minor is D F A, three white keys. D major needs a black key: D F♯ A. Counting from D, F is 3 semitones up (minor third) and F♯ is 4 (major third).

So black keys don’t mean minor. What decides is the distance from the root to the third. Also note the spelling: the third of D is always some kind of F (D, E, F: three letters), so it is written F♯, not G♭, even though they are the same key.

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D F♯ A: from D to F♯, 4 semitones. Written D.

The same thing happens on E and A: E minor is E G B and A minor is A C E, all white keys, while E major (E G♯ B) and A major (A C♯ E) each take a black key in the middle.

What you hear, and what context changes

What does that one semitone do to the sound? Many listeners hear a minor chord as darker, softer or more inward, and a major chord as brighter or more open. That is a tendency, not a rule. A fast, rhythmic piece in minor can sound full of energy; a slow, quiet major chord can sound wistful. Tempo, rhythm, register and the chords around it all shape the feeling.

So rather than listening for an emotion, listen for the middle note. In a major chord it sits a little higher, further from the root; in a minor chord it sits closer. Try it on a piano: hold the root and fifth, and move only the third down a key and back up.

Your turn

Major or minor?

Question 1 of 8

Listen: is this chord major or minor?

In short

  1. Major and minor chords on the same root differ by one note, the third.
  2. Major third: 4 semitones; minor third: 3. The fifth stays at 7 in both.
  3. Black keys don’t decide: D major is D F♯ A, D minor is all white keys.
  4. Many listeners hear minor as darker, but tempo, rhythm and context shape the feeling.