Other than these "key doublings", Ravel simply harmonizes the melody using diatonic chords.

Alterations from the natural diatonic chords can be specified as C ... etc.

The song is tuneful, with a prominent series of three descending diatonic chords providing the main hook.

Other areas of study include modulation, enharmonic notes, ornaments, diatonic chords, and jazz chord symbols.

Thus the non-diatonic chord progression constructed from chords diatonic to each mode:

Mompou adds compromising notes to diatonic chords, creating states of ambiguity.

Non-free jazz forms used harmonic structures (usually cycles of diatonic chords).

In music, a passing chord is, "a nondiatonic chord that connects, or passes between, the notes of two diatonic chords."

A diatonic passing chord may be inserted into a pre-existing progression that moves by a major or minor third in order to create more movement." "

Any chord that is not chromatic is a diatonic chord.