How to Build Chords: Triads & Seventh Chords

# How to Build Chords: Triads & Seventh Chords

If the first post in this series gave you the alphabet of music — notes, scales, and intervals — then chords are where you start forming words and sentences. Chords are the backbone of virtually every song you've ever loved, and understanding how they're built gives you serious power as a songwriter or producer.

Let's break down exactly how chords work, starting from the simplest triad all the way up to seventh chords that add color and sophistication to your tracks.

A chord is three or more notes played simultaneously. That's it. But the specific combination of notes — the intervals between them — determines whether a chord sounds happy, sad, tense, dark, or dreamy.

Every chord is built by stacking intervals on top of a starting note called the root. The most fundamental chords are triads, which use exactly three notes.

A triad is built by stacking two thirds on top of each other. Remember from our intervals post: a major third spans 4 half steps, and a minor third spans 3 half steps. The type of thirds you stack determines the type of triad.

The Four Triad Types

Here's your quick reference chart:

Building a Major Triad

Start with any note — let's use C.

1. 1Root: C
2. 2Major third above C: Count 4 half steps → E
3. 3Minor third above E: Count 3 half steps → G

Result: C Major = C - E - G

The total distance from root to top note is a perfect fifth (7 half steps). That perfect fifth is what gives major and minor triads their stable, grounded sound.

Building a Minor Triad

Same root, different stacking:

1. 1Root: C
2. 2Minor third above C: Count 3 half steps → Eb
3. 3Major third above Eb: Count 4 half steps → G

Result: C Minor = C - Eb - G

Notice the only difference is that middle note — the third is lowered by one half step. That single half step is the difference between a happy chord and a sad one. Music is wild like that.

Building a Diminished Triad

1. 1Root: C
2. 2Minor third above C: 3 half steps → Eb
3. 3Minor third above Eb: 3 half steps → Gb

Result: C Diminished = C - Eb - Gb

Two minor thirds stacked. The distance from root to top is a tritone (6 half steps) — historically called "the devil's interval" because of its intense dissonance. Diminished chords create tension that wants to resolve somewhere.

Building an Augmented Triad

1. 1Root: C
2. 2Major third above C: 4 half steps → E
3. 3Major third above E: 4 half steps → G#

Result: C Augmented = C - E - G#

Two major thirds stacked. This chord has a floating, unresolved quality. You'll hear augmented chords in songs by The Beatles, Radiohead, and plenty of film scores.

You'll see chords written in shorthand everywhere — lead sheets, chord charts, DAW plugins. Here's how to decode them:

When you see a chord symbol with no modifier, it's always major. This trips up beginners constantly — just a letter by itself means major.

An inversion rearranges the notes of a chord so the root isn't on the bottom.

Using C Major (C - E - G):

The notes are identical — you're just changing which one is lowest. Inversions are critical for creating smooth chord progressions. Instead of jumping your bass note around, you can move it by small steps, creating that professional, flowing sound.

Producer tip: In your DAW, try taking a chord progression and moving the top note of each chord down an octave (or the bottom note up). You'll hear the same harmony but with completely different voice leading. This is one of the fastest ways to make basic chords sound polished.

Triads are three notes. Seventh chords add a fourth note — the seventh degree above the root. This extra note adds richness, tension, and color.

Just like triads, the type of seventh chord depends on which triad you start with and which type of seventh you add.

The Five Essential Seventh Chords

Dominant 7th: The Blues Machine

The dominant 7th is probably the most important seventh chord in popular music. It's built from a major triad plus a minor seventh (flatted seventh).

That b7 creates a tension that wants to resolve — it pulls you to the next chord. This is the engine behind the blues, behind every V7-to-I resolution, and behind that gritty funk sound.

Think of the opening chord of any 12-bar blues. That's a dominant 7th.

Major 7th: The Smooth Operator

A major triad plus a major seventh (natural seventh). This chord sounds lush, sophisticated, and slightly dreamy. It's everywhere in neo-soul, lo-fi hip-hop, and jazz.

When you hear that warm, floating chord in a Daniel Caesar or Frank Ocean track, you're hearing major 7ths.

Minor 7th: The Vibe Setter

A minor triad plus a minor seventh. Smooth, slightly melancholic, incredibly versatile. Minor 7th chords are the foundation of jazz harmony and appear in everything from Erykah Badu to J Dilla beats to contemporary R&B.

Here's where theory meets practice. When you're building chords in a DAW like Ableton, FL Studio, or Logic:

Start with triads. Drop in a root note, then add the third and fifth above it. Use the piano roll grid to count half steps if you need to.

Try inversions. Select the top note of your chord and drag it down an octave. Or select the bottom note and drag it up. Listen to how the voicing changes.

Add sevenths. Take any triad and add one more note a third above the top note. Experiment with both major and minor sevenths to hear the difference.

Spread your voicings. Instead of stacking all notes close together, try putting the root down low, skipping an octave, then placing the third and seventh higher up. This "open voicing" sounds much more professional than stacked close-position chords.

Use MIDI chord tools. Many DAWs have chord generators or MIDI effects that let you trigger full chords from a single note. These are great for experimentation, but make sure you understand what the tool is actually doing — that's how you develop real harmonic intuition.

1. 1Pick any note as your root
2. 2Build all four triad types from that root
3. 3Now add a minor seventh (b7) to each one — you've got four different seventh chords
4. 4Play each chord and really listen to the mood
5. 5Record yourself improvising a melody over each chord — notice how different each one feels

This exercise takes ten minutes and will do more for your ear than reading about chords for an hour.

• Confusing chord symbols: "C" means C major, not C minor. "C7" means C dominant 7th, not C major 7th. The naming conventions are not perfectly logical — you just have to learn them.
• Ignoring inversions: If your chord progressions sound clunky and jumpy, you're probably using all root-position chords. Inversions smooth everything out.
• Overcomplicating things: You don't need to use seventh chords everywhere. Sometimes a simple triad is exactly what the song needs. Complexity isn't automatically better.

Now that you can build chords, you need a system for communicating them quickly — especially if you're working with other musicians. In the next post, we'll cover The Nashville Number System, the shorthand that session musicians across every genre use to call out chords on the fly. It's one of the most practical skills you can learn, and it'll change how you think about chord progressions forever.