Triads & Building Chords

Open any chord book and it looks endless — hundreds of grids, each one its own little puzzle to memorize. But underneath nearly all of them is a single, simple idea, and once you’ve got it, that fat book shrinks to a handful of rules.

Every basic chord is three notes pulled from a scale: a root, a third, and a fifth. Take a scale, grab the 1st note, skip one, take the 3rd, skip one, take the 5th. That three-note stack is called a triad, and it’s the seed of every chord you’ll ever play. You can see the whole move in one place — how chords are actually built walks through it step by step.

Each of those three notes has a job. The root names the chord. The fifth makes it sound solid and full. And the third — the middle note — decides the mood. Leave it high and you get a bright major chord; drop it one fret and the same chord turns dark and minor. That one note is the difference between happy and sad.

Stack the three notes a few different ways and you get the four basic chord types — major, minor, diminished, augmented — each set by its third and fifth. Want a worked example? The notes inside a G major chord shows the recipe in action: G, B, and D, straight out of the G scale.

Start with the triad. Get comfortable seeing the root, third, and fifth inside a shape, and every bigger chord after that is just the same three notes with extras piled on top.

Common questions

What is a triad?
A triad is a three-note chord made of a root, a third, and a fifth. It’s the smallest complete chord and the foundation every other chord is built on.

How are guitar chords built?
By stacking thirds from a scale: take the 1st note, skip to the 3rd, skip to the 5th. Those three notes form the basic chord. Bigger chords keep stacking more notes on top.

Which note makes a chord major or minor?
The third. A major third gives a bright, major chord; lowering that one note by a fret makes it a darker minor chord. The root and fifth stay the same.