Building triads
Finger, skip, finger, skip, finger — and that is the whole chord. And one finger moving one key turns happy into sad.
Until now you have played one note at a time. Today you play three together, and this is the moment the piano stops sounding like an exercise and starts sounding like a song.
And the good news is that you already know where everything is. The first chord is built entirely out of the same five-finger position you played a melody in last lesson — you simply press three fingers at once instead of one after another.
Put your right hand in its usual home: finger one on middle C, and all the rest in order up to G.
Now press fingers one, three and five together. You skipped two and four.
That is C major, and you have just played a complete chord. Those three notes are called a triad — three notes built by skipping, which arrive at the ear as a single color.
The card above shows exactly what your fingers are doing: the left-hand note is C, the middle one is E, the right one is G. Notice that the leftmost note is the one that gives the chord its name — it is called the root, and every chord name you will ever meet begins with it.
And check the sound: play each of the three separately before you press them together. If one of them does not speak, you now know which one. That is far more useful than "the chord sounds odd", and it is the check almost no beginner makes.
Now the magic, and it takes one second.
Hold the same chord and move only the middle finger one key to the left — onto the black key that sits just below E, the second of the group of two. The other two fingers do not move at all.
Hear what happened? The chord turned sad. That is C minor.
And that is the entire difference between major and minor, in every chord, in every song in the world: the middle note, by a half step. There is nothing else to remember — the middle finger goes up and it is happy, the middle finger comes down and it is sad.
Go back and forth a few times, and listen. This is the moment most people first understand that music theory is not a list of rules but a description of something the ear already knows. If you are curious about why that particular note is the one that decides, the musical sandwich takes it apart piece by piece.
Now we assemble the team. The next six chords all sit on white keys only, and between them they will play an absurd number of songs.
The method is identical in all of them: put your thumb on the root, skip one white key, put a finger down, skip again, put a finger down. Fingers one, three and five, always. The second column of the table may be new to you: it is the chord's number inside the key of C, the shorthand musicians use to talk about a progression without naming a single note, with capital numerals for the major chords and small ones for the minors.
| Chord | Degree in C | The three notes | Type |
|---|---|---|---|
| C | I | C, E, G | major |
| Dm | ii | D, F, A | minor |
| Em | iii | E, G, B | minor |
| F | IV | F, A, C | major |
| G | V | G, B, D | major |
| Am | vi | A, C, E | minor |
Notice something odd: they are all built by exactly the same method, and yet three came out happy and three came out sad. You did not choose that — it falls straight out of the distances between the white keys, which are not equal. Why it works out precisely that way is the subject of families of chords; for now it is enough to know that this is what you get.
The chord dictionary — see any chord on the keys before you try it
Every scale holds seven chords, not six. The seventh one here is B, and it is the only one of the seven that sounds unstable — it contains a cramped interval that makes it sound as though it has to go somewhere else immediately. It is called diminished, it is extremely useful, and it simply has no business in a first lesson about chords.
What does matter is this: these six chords are not an arbitrary collection. They are every chord that can be built on white keys alone, and that is why they sound good together. Any combination you try from among them will sound sensible, including one you invented yourself a second ago. Try it: play Em, then Am, then F, then G. You followed no rule, and it works.
It also means the next step is already within reach. To play those same six chords in another key you move the whole shape — and this time black keys really do come in. But the method, finger-skip-finger-skip-finger, never changes.
After the first day people try to remember lists: "C is C-E-G, D minor is D-F-A." That works for three chords and collapses at six.
What does work is remembering one pattern and running it: finger on the root, skip a white key, finger, skip, finger. Three moves, and you are done. You are not remembering six chords — you are remembering one method and running it six times.
And the difference between major and minor is not remembered at all, it is heard: play it, and if it sounds sad it is a minor. After a week the ear decides faster than any table can.
The check I recommend doing once a day: say one of the six names out loud at random, and count how long the hand takes to find it. That number drops quickly, and watching it drop is what keeps people practicing.
If you once tried the guitar and broke your teeth on a chord, it is worth knowing why this feels different.
On a guitar every chord is a shape of its own: the hand reorganizes itself, fingers press different strings at different frets, and one finger touching its neighbor mutes it. On a piano every chord is the same pattern: finger, skip, finger, skip, finger. The only thing that changes is where you begin.
That also means the next step on the piano is far cheaper: to play the same chord higher or lower, you simply move your hand. There is nothing to relearn.
And what is hard here instead: three notes have to go down exactly together. A chord in which one finger arrives a tenth of a second ahead of the other two sounds smeared, and that is the one thing in this lesson that genuinely needs practice.
The common mistake is to sit and play the same chord twenty times. That is close to useless — after the third go the hand already knows it, and the rest is waste.
What does need practice is the change. Here is the method:
Lifting the hand in between is not for show: it forces you to find the chord again every single time, and that is exactly what will happen in a real song.
Metronome at 60 — four beats per chord, then change
And when that starts to work, play the sequence C, Am, F, G, four beats each, and go round eight times. You will hear that it is no longer an exercise but a whole song. Those four chords, in that order, carry a frightening number of hits, and the pop progressions lesson takes that song apart.
| What you hear | The likely cause | The fix |
|---|---|---|
| The chord sounds smeared | The fingers are not landing together | Lift the hand and land all at once, slowly |
| One note is missing | That finger never went all the way down | Play each note on its own and find the culprit |
| It sounds muddy and crowded | The chord sits too low on the instrument | Move the whole hand up an octave |
| The little finger barely speaks | It is the shortest and the weakest one | Let the weight of the arm fall towards it |
| Major and minor keep getting mixed up | You are trying to remember instead of listen | Play both back to back, twice a day |
| Finding the root is slow | Your eye is not scanning the black keys yet | Go back to the groups of two and three |
You have six chords. Now let us learn to move the hand less, and that is the inversions lesson.