THE 4 BASIC TRIADS

One Trick, Four Different Sounds

The 4 Basic Triads — Major, Minor, Diminished, Augmented

In our previous lesson, you learned to build Major and minor triads by stacking thirds. But there are actually 4 basic triad types in music — and the other two, Diminished and Augmented, are just as important once you start playing real jazz harmony.

The good news: you already know the method. We're just going to apply it two more times.

The Skeleton: One Pattern, Four Chords

Every triad is built the same way: you stack two thirds on your root. Each third is either 2 tones or 1.5 tones — which two you pick, and in what order, gives you all four triad types.

The 4 Personalities

Table comparing the 4 basic triad types — Major, Minor, Diminished, and Augmented — with their interval recipe, sound character, and example notes built from C

Notice the pattern: Major and minor use one of each (a Major 3rd and a minor 3rd, just in different order). Diminished and Augmented use the same interval twice in a row.

Why Diminished Sounds Tense

A Diminished triad lowers the 5th by a semitone compared to a Major chord (G becomes Gb). This means the chord loses its "Perfect 5th" — the stable anchor we talked about in Lesson 1. Without that anchor, the chord feels unresolved, like it's pulling toward something else.

Why Augmented Sounds Mysterious

An Augmented triad raises the 5th instead (G becomes G#). The chord stretches beyond its natural resonance — neither bright nor dark, just suspended in air. This is why Augmented chords are often used for dramatic or "floating" moments in music.

The One-Semitone Transformation Trick

Here's something powerful: you can transform any Major chord into the other three types by moving just one note by a single semitone.

Major → Minor: lower the 3rd (E → Eb)
Major → Augmented: raise the 5th (G → G#)
Minor → Diminished: lower the 5th (G → Gb)

This means you're not learning 4 unrelated shapes — you're learning one shape with 3 simple variations.

Quick Summary

To identify any triad:

Find the Root, 3rd, and 5th
Measure Root to 3rd: 2 tones = Major character, 1.5 tones = minor character
Measure Root to 5th: 3.5 tones = Perfect/stable, 3 tones = Diminished, 4 tones = Augmented

What's Next

Now that you know all 4 triad types, you're ready to add the 4th note — the 7th — and discover the 5 chord families that define jazz harmony

👉 The 5 Core Chord Families

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