Piano chords explained

Chords are the most important thing you will ever learn on the piano. This guide covers the shapes you play most — major, minor, and seventh chords — with clear explanations of how to find, build, and name them.

What a piano chord actually is

A chord is three or more notes played together at the same time. On the piano, that means pressing multiple keys simultaneously with one or both hands. The notes you choose, and the distance between them, determine whether the chord sounds happy or sad, stable or tense, simple or sophisticated.

Every chord has a name. That name tells you two things: the root note (the letter name — C, G, F, etc.) and the quality (major, minor, dominant, etc.). When a lead sheet says "play C major," you know exactly which three notes to press. Knowing chord names lets you play from charts, communicate with other musicians, and understand the theory behind what you are playing.

Your first chord: C major

C major is the most natural starting chord on piano because it uses only white keys. Find C — the note immediately to the left of the group of two black keys. From C, skip one white key and press E. Skip another white key and press G. C, E, and G pressed together is C major — the tonal home chord of the most common key in music.

The three notes of any triad are called the root, third, and fifth. For C major: C is the root, E is the major third (4 semitones above C), and G is the perfect fifth (7 semitones above C). This pattern — root + major third + perfect fifth — is the formula for every major chord on the piano.

Five major chords every pianist should know

Major chords are the backbone of piano harmony. They sound bright, open, and stable, and they appear in virtually every piece of music you will play. These five are the most commonly encountered in pop, gospel, worship, and folk music.

Notice that C, G, and F major all use only white keys, making them ideal starting chords. As you add more major chords to your vocabulary, you will encounter black keys — sharps and flats — that are just as straightforward once you know the 4+3 interval formula.

Minor chords: the emotional counterpart

A minor chord sounds darker and more emotional than its major counterpart. The only difference is a single semitone: instead of a major third (4 semitones) above the root, a minor chord uses a minor third (3 semitones). That one-key change transforms the sound completely.

The three minor chords you will play most often are A minor, D minor, and E minor — these are the natural minor chords of C major and are essential for playing in that key. Minor chords provide emotional contrast and depth in any progression. The vi chord (A minor in C major) is the most important minor chord in pop and worship music.

Seventh chords: moving from simple to sophisticated

Seventh chords add a fourth note to the basic triad — the seventh scale degree above the root. This extra note adds colour, richness, and harmonic function. There are three types you will encounter most often:

The G7 chord is the dominant seventh of C major — the most harmonically active chord in the key, which creates an irresistible pull back to C. The Cmaj7 replaces the plain C chord for a softer, more sophisticated sound common in jazz and gospel. Seventh chords are essential for any style beyond basic beginner playing.

Reading chord symbols quickly

Once you understand the naming system, reading chord charts becomes fast and natural. The letter gives you the root; the suffix tells you the quality.

Building any chord from scratch

Once you know that major chords use intervals of 4+3 semitones and minor chords use 3+4, you can build any triad on any starting note without memorising each chord separately. Dominant seventh chords add a minor seventh (10 semitones from the root) on top of the major triad. Major seventh chords add a major seventh (11 semitones) instead.

The interval approach means you can transpose any chord to any key by applying the same formula to a new starting note. This is the kind of structural understanding that sets apart musicians who know their instrument from those who are just following patterns. Explore the C major scale and G major scale pages to see how the same interval patterns generate all the diatonic chords in those keys.

How ChordBeam identifies what you play

ChordBeam's chord detector listens to your MIDI keyboard and names every chord you play in real time — including the root, quality, any extensions, and the bass note (for inversions). When you play a chord you do not recognise by name, ChordBeam identifies it instantly. When you want to understand a chord you already play, click through to its detail page in the Chord Library for the full theory explanation.

The Chord Library itself has 229 chord pages — twelve roots across nineteen types — covering everything from basic triads to extended jazz voicings. Each page shows the notes, intervals, sound character, and which progressions and scales the chord appears in. The blues-based chords in the Blues Progression are a great starting point if you want to understand dominant seventh chords in action.