Diatonic chords are the chords built only from the notes of a single scale or key. Because they all come from the same seven notes, they sound like they belong together — which is exactly why most songs use them. In this guide you’ll learn how to build all seven diatonic chords in any major key and how to put them to use.
What “diatonic” actually means
Diatonic simply means “belonging to the key.” A C major scale contains C, D, E, F, G, A and B. Any chord made strictly from those notes is diatonic to C major. Add a note outside the scale (like F#) and the chord becomes chromatic, or non-diatonic. To build chords you stack notes in thirds, so understanding triads first will make this easier.
How to build the seven diatonic chords
Take each note of the scale as a root, then stack the next two scale notes (every other note) on top to form a triad. In C major:
- C–E–G = C major (I)
- D–F–A = D minor (ii)
- E–G–B = E minor (iii)
- F–A–C = F major (IV)
- G–B–D = G major (V)
- A–C–E = A minor (vi)
- B–D–F = B diminished (vii°)
The pattern that works in every key
The quality of each chord follows a fixed pattern in every major key: major, minor, minor, major, major, minor, diminished. In Roman numerals that’s I, ii, iii, IV, V, vi, vii°. Memorize that one pattern and you can spell the diatonic chords of any major key. In G major, for instance, you get G, Am, Bm, C, D, Em and F#dim. This is also why finding a song’s chords helps you work out the key of a song.
Why diatonic chords sound good together
Since every chord shares notes from the same scale, moving between them creates smooth voice leading and no jarring clashes. The I, IV and V are the “primary” chords that carry most songs, while ii, iii and vi add color and emotion. Almost every common chord progression is built from these seven chords. Once you’re comfortable, you can add a fourth note to make seventh chords for a richer sound.
Frequently asked questions
What’s the difference between diatonic and chromatic chords?
Diatonic chords use only notes from the current key. Chromatic chords include at least one note from outside the key, which is how songwriters create tension or color, such as with secondary dominants and borrowed chords.
Are minor keys diatonic too?
Yes. Minor keys have their own set of seven diatonic chords. In A natural minor the pattern is i, ii°, III, iv, v, VI, VII (Am, Bdim, C, Dm, Em, F, G). Many minor-key songs raise the v to a major V chord for a stronger resolution.
How many diatonic chords are there in a key?
Seven, one built on each note of the scale. As triads they give you three major, three minor and one diminished chord. Adding a seventh to each gives you seven diatonic seventh chords instead.
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