Major vs Minor Chords: What Makes Them Different?

Of all the questions beginners ask about music theory, “what’s the difference between major and minor?” is one of the most common. And the answer is beautifully simple: just one note.

What Is a Chord?

A chord is three or more notes played simultaneously. The most basic type of chord is a triad, which has exactly three notes.

Building a Major Chord

A major chord is built by taking a root note and stacking two intervals on top:

1. Start with any note (the root)
2. Add a note a major third (4 semitones) above
3. Add a note a perfect fifth (7 semitones) above the root

For example, C major: C – E – G

Building a Minor Chord

A minor chord uses the same structure, but the middle note (the third) is lowered by one semitone:

1. Start with any note (the root)
2. Add a note a minor third (3 semitones) above
3. Add a note a perfect fifth (7 semitones) above the root

For example, C minor: C – E♭ – G

Why Do They Sound Different?

The single semitone difference between the major third and minor third has an enormous impact on the sound. Major chords tend to sound bright, resolved, and “happy.” Minor chords tend to sound darker, more melancholic, or “sad.”

This is partly psychoacoustic (the physics of sound) and partly cultural conditioning — Western music has associated minor with sadness for centuries.