What is a chord?
A chord is what you get when several notes sound together at once. It's the "harmony" behind almost every song — the warm, full sound under a melody. Here's how chords work, in plain English.
If a melody is a single line you can hum, a chord is the color behind it. Strum a guitar, press three piano keys, or hear a choir hold a note each — that's a chord. And once you know how they're built, you'll spot them everywhere.
Learn it by listening
Chords are easiest to understand when you hear them. Our free arcade turns listening into quick games — keep this guide open and jump in whenever.
The simple definition
A chord is three or more notes played at the same time. (Two notes together is usually called an interval, the building block we stack to make chords.) Chords create harmony — the supporting sound that gives a melody depth and emotion.
The triad: the most common chord
The everyday chord you hear most is the triad — three notes built by stacking thirds. You start on a root note, skip up a third, then skip up another third:
- Root — the note the chord is named after (the C in a C chord).
- Third — a third above the root; this note decides major vs. minor.
- Fifth — a fifth above the root; it makes the chord sound full and stable.
So a C major chord is C – E – G. A G major chord is G – B – D. Same recipe, different starting note.
Major vs. minor: a one-note difference
The most important contrast in chords is major versus minor — and the only thing that changes is the middle note:
- A major chord has a major third on the bottom and sounds bright, open, happy (C – E – G).
- A minor chord lowers that middle note by a half step to a minor third and sounds darker or sadder (C – E♭ – G).
Train your ear to hear "happy or sad?" and you've taken your first real step into harmony.
Beyond triads
Once you've got triads, the family grows:
- Seventh chords stack one more third on top (a Cmaj7 or a dominant G7), adding richness and tension.
- Inversions reorder the same notes so a different one is on the bottom — same chord, new flavor.
- Suspended, diminished, and augmented chords tweak the recipe for special colors.
You don't need these on day one. Master major and minor triads first; everything else builds on them.
Why chords matter
Chords are the harmony under almost all the music you hear. A chord progression — a sequence of chords — gives a song its shape and emotion. Knowing chords lets you accompany a singer, write your own songs, and understand why a piece feels the way it does.
Echo
A call-and-response pitch game: listen, then match it back. The best way to start hearing the notes inside chords — no reading required.
A simple practice plan
- Learn the triad recipe: root, third, fifth.
- Hear major vs. minor until "happy or sad?" is instant.
- Sing the notes of a chord one at a time — the root, then the third, then the fifth.
- Practice a few minutes daily. Short and frequent wins.
Frequently asked questions
What is a chord in music?
A chord is three or more notes sounded together. The most common chord is the triad, which stacks two thirds to make a rich, full sound. Chords provide the harmony that supports a melody.
What's the difference between a major and minor chord?
Both are triads built on a root note. A major chord has a major third on the bottom and sounds bright and happy. A minor chord has a minor third on the bottom and sounds darker or sadder. Only one note moves by a half step between them.
How are chords built?
A basic triad starts on a root note, then adds the note a third above it, then another third above that. For example, C major is C, E, and G. Stacking more thirds creates seventh chords and beyond.
How do I learn to hear chords?
Start by hearing the difference between major (bright) and minor (dark), then add more chord types over time. Ear-training games like Echo build recognition quickly and make practice fun.
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