Chromatic approach chords are chords that are located one semitone above or below the chord you want to solve, and they have the same structure of this chord. For example, in the sequence | Dbm7 | Dm7 |, the chord Dbm7 has chromatic approach function. This kind of chord uses to have a short length in the bar line, serving just as a “passage” to the next chord. See the following chords progression:
| Dm7 G7 | Em7 A7 | Dm7 Db7 | C7M |
Adding chromatic approach chords, this progression could be:
| Dm7 Ab7 G7 Fm7 | Em7 G#7 A7 Ebm7 | Dm7 D7 Db7 B7M | C7M |
SubV7 as chromatic approach chord
Notice that, in some cases, the chord subV7 can be seen as a chromatic approach chord (when that chord that comes after it has the same shape, for example: G#7 | A7).
Though, the chord subV7 cannot be taken as only chromatic approach chord in these situations, because it is a dominant chord that serves as substitute of fifth degree (V7), for reasons that we will show in another topic. Saying that it has only chromatic approach function would limit it too much.
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