Stop 2 of 6
Modal interchange
Chords borrowed from the parallel mode.
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Stop 2 of 6
Chords borrowed from the parallel mode.
Secondary dominants add pull. adds something different: light and shade. Without leaving the key, you borrow chords from its dark twin, the minor mode with the same tonic, and the music changes colour the way a landscape does when a cloud covers the sun. It is one of the favourite devices of songwriters, film composers and jazz players alike.
Listen to these two progressions. The first is pure C major. The second adds just one chord, in bar three:
Did you notice the change of colour? Fm does not belong to C major, yet it doesn't take us to another key either: C comes back and everything is still at home. Compare the two F chords:
The difference is one note: A drops to A♭. And that A♭ is the ♭6 of C, a note that only exists in C minor. You have borrowed a chord.
Line up the chords of C major above those of C minor. The ones with the same root but a different shape are your borrowed colours:
These are the most common borrowings in C major. Notice that each contains at least one of the three "dark" notes of C minor: E♭, A♭ or B♭.
| Degree | Chord | Notes | Borrowed note | Character |
|---|---|---|---|---|
| iv | Fm | F Ab C | A♭ | nostalgia, tenderness |
| bVI | A♭ | Ab C Eb | A♭, E♭ | epic, cinematic |
| bVII | B♭ | Bb D F | B♭ | rocky, bright |
| bIII | E♭ | Eb G Bb | E♭, B♭ | surprise, punch |
| iiø | Dm7♭5 | D F Ab C | A♭ | dark, sets up V |
The most famous borrowing is the minor iv. Its magic is not in the chord on its own but in an inner voice that falls by half steps: the sixth of the scale (A) drops to the minor sixth (A♭) and then to the fifth (G). Play this sequence of open chords and listen to the third string: fret 2, fret 1, open.
Some variants intensify that colour. Fm6 adds D, which is the ninth of C and smooths the move; Fm7 adds E♭, which is more melancholy.
If the minor iv is nostalgia, the bVI–bVII–I pair is triumph. The bass climbs by whole steps (A♭ → B♭ → C) and the last chord arrives like a sunrise. It is a sound heard constantly in rock, video games and film scores.
bVII also appears on its own as an alternative to V: B♭ → C is a cadence without a leading tone, more open and rock-flavoured than G → C. You can think of it as a borrowing from the mode, which also has B♭.
Now combine the minor iv with bVII turned into a seventh chord: Fm7 – B♭7 – Cmaj7. This is the : a ii–V borrowed from the parallel minor (Fm7 is the ii of E♭ major and B♭7 its V) that, instead of going to E♭, slips into C through the back door.
Listen to why it works: the seventh of B♭7 (A♭) falls to G, and its third (D) moves up or down to a note of Cmaj7. There is no leading tone, so the arrival is gentle, almost a sigh.
The other classic way to darken the cadence is to borrow the iiø from the minor: Dm7♭5 – G7 – Cmaj7. The A♭ in that ii anticipates the ♭9 that often colours the dominant.
The parallel minor is the main donor, but any mode with the same tonic can lend chords. Some classics on C:
| Donor mode | Chord | Degree | Characteristic note |
|---|---|---|---|
| D | II | F♯ (♯4) | |
| B♭, Gm | bVII, v | B♭ (♭7) | |
| D♭ | bII | D♭ (♭2) | |
| (in minor) | F in C minor | IV | A (6) |
D as a Lydian II differs from D7 (V/V) because it doesn't resolve to G: it floats and returns to C. Hear that Lydian light:
You don't need to memorise tables for every key. Follow three steps:
Hear the epic climb moved to G: the same story on a different stage.
On guitar this move is instant: if you play the chords as barre shapes, just shift every shape five frets (from C to F) or seven (from C to G). The degrees don't change.
To analyse a chord from outside the key, ask three questions:
Some chords allow two readings: B♭7 can be a borrowed bVII7 (backdoor) or V7/IV in the key of F. Decide by where it goes.
If all your borrowings come from C minor, there's a lovely shortcut: play the notes of C natural minor while the borrowed chord sounds, and return to C major when the diatonic harmony comes back. Over Fm7 that gives F Dorian; over A♭maj7, A♭ Lydian; over B♭7, B♭ Mixolydian. One scale, three colours.
String 6, Fret 8: C3 · 1 · Root
Goal: Loop C – F – Fm – C for two minutes with the third string (A → Ab → G) ringing clearly at every change.
Start from C – Am – F – G and each time swap one chord for a borrowed one: Fm, A♭, B♭, E♭ or Dm7♭5. Play each version twice with this backing as a reference and write down which one tells a better story.
Goal: Write and play five versions of a four-bar progression, each with a different borrowed chord, and pick your favourite.
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