Harmony

In the previous lessons you played one note at a time. A chord is what happens when you play several notes at the same time. That simple.

The most basic type is called a triad: three "stacked" notes. Take a note from the scale, skip one, take the next, skip another, take the third. Three notes vibrating together create a new color.

The 3rd is the magic note: if you lower it a half step (E → E♭), the chord goes from major to minor. Sound familiar? It's the same idea from Lesson 1.

☀️ C · E · G — the three keys form the triad.

If you build a triad from each note of the C major scale, you get 7 chords — always the same, in the same order. Three are major, three minor, and one strange one (diminished).

These 7 are the pop composer's entire palette. They wrote "Yesterday", "Bohemian Rhapsody", "Billie Jean" and practically any song you know.

Tap each card to hear how it sounds. Notice each one's personality.

A single chord sounds nice, but the real magic happens when you chain several together. That's a chord progression: a sequence that repeats as a cycle throughout the whole song.

And here's the revelation: a handful of progressions appear in hundreds of famous songs. The most powerful of all is I – V – vi – IV.

💡 Try all the progressions. Notice how the same 7 "LEGO pieces" create completely different moods depending on the order.

So far you've heard chords as blocks — all notes at once. But the way you unfold those notes is what gives music its character. The same C major can sound like rock, a ballad, a waltz or pop, depending on how you articulate it.

Tap each card to hear the difference with the same chord.

💡 Each progression in the previous section uses a different pattern — now that you know them, you can spot them in any song you hear.

These songs sound completely different, but share exactly the same progression — I – V – vi – IV:

How can they sound so different? Because what changes is the melody, the rhythm, the timbre and the tempo. The chords are the skeleton; everything else is the personality.

It's like a canvas: I–V–vi–IV is the frame. Each artist paints something different on it. And that's why it doesn't "sound like a copy" — it sounds like the magic of functional harmony.

You just discovered that seemingly different songs use the same chords. The question is: why does that combination work?

The answer is that each chord has a function — a role it plays in the song. The 7 chords you learned group into just 3 families:

Every tonal song on the planet tells the same story with these three families: it leaves home (T), travels (S), creates tension (D), and returns home (T). That's it. Everything else is a variation on that narrative.

💡 When you build your own progressions, try to follow a T → S → D → T pattern. It sounds good almost always. The deviations (like the deceptive cadence you'll see in a moment) are what create the memorable moments.

A cadence is the last two chords of a musical phrase — the "door" you close an idea with. Change the cadence and the whole ending feeling changes, even if the melody is identical.

There are four big ways to close. Play them — the difference between them is the difference between a period, a semicolon, an ellipsis and a plot twist.

💡 If a song leaves you feeling "there's still more", it almost certainly ends on a half or deceptive cadence. If it lets you go in peace, it's authentic or plagal. You learned to notice how a song closes — that's a composer's ear.

Now it's your turn. Pick 4 chords from the 7 available — any combination works. Hit play and hear how they sound together. Try reordering them.

Gentle rules: starting with I gives a feeling of safety. Ending on V creates the expectation of returning to the start. And using vi in any position adds emotion.

• ✅ A chord is 3+ notes sounding at the same time.
• ✅ The major scale generates 7 chords: 3 major, 3 minor, 1 diminished.
• ✅ A progression is a sequence of chords that repeats.
• ✅ I–V–vi–IV is the most-used progression in the history of pop.
• ✅ Articulation (block, arpeggio, wave, broken, alternating, boom-chick) changes a chord's character without changing its notes.
• ✅ The 7 chords group into 3 families: tonic (rest), subdominant (motion), dominant (tension). Every tonal song tells the same T → S → D → T story.
• ✅ Cadences (authentic, plagal, half, deceptive) are the 4 ways to close a phrase.
• ✅ Same harmonic skeleton + different melody/rhythm/timbre = a new song.