In music, a passing chord is, "a nondiatonic chord that connects, or passes between, the notes of two diatonic chords."[3] "Any chord that moves between one diatonic chord and another one nearby may be loosely termed a passing chord. A diatonic passing chord may be inserted into a pre-existing progression that moves by a third in order to create more movement."[4] "'Inbetween chords' that help you get from one chord to another are called passing chords."[5]
For example in the chord progression[4]:
|Cmaj7 |Em7 |Dm7 |G7 |
the diatonic passing chord (Dm7) may be inserted:
|Cmaj7 Dm7 |Em7 |Dm7 |G7 |
or the chromatic passing chord (Ebm7) may be inserted:
|Cmaj7 |Em7 Ebm7 |Dm7 |G7 |
A chromatic passing chord is, "a chord that is not in the harmonized scale"[6].
Passing chords may be consonant or dissonant[7] and may include flat fifth substitution, scalewise substitution, dominant minor substitution, approach chords, and bass-line-directed substitution[5].
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