Harmony
Diatonic
- Definition
- Diatonic describes the notes and chords that occur naturally within a given key's major or minor scale, without pitches borrowed from outside it.
- Difficulty
- Intermediate
- Songwriting stage
- writing
In practice
Every major or minor key generates its own family of seven chords, one built on each scale degree. These are the diatonic chords of that key, and they are the first harmonic palette most songwriters learn to use. Staying diatonic keeps a progression feeling settled and unified, because every chord shares the same scale and pulls naturally toward the same tonic.
Once a writer is comfortable moving between diatonic chords, stepping outside that palette, using a borrowed chord or a brief modulation, becomes a deliberate, noticeable choice rather than an accident. Understanding diatonic harmony first makes those later departures far more effective.
Example
In the key of C major, a writer builds an entire bridge using only the diatonic chords C, Dm, Em, F, G, Am, and Bdim, so that when a non-diatonic chord finally appears in the next section, it stands out as a clear turning point.