Harmony
Modal interchange (borrowed chords)
Modal interchange means using chords borrowed from a parallel mode with the same tonic, such as Fm, A♭ or B♭ taken from C minor in a song in C major.
What is modal interchange?
A song in C major normally uses the seven diatonic chords of C major. Modal interchange means borrowing a chord from another mode with the same tonic: C minor, C Mixolydian, C Dorian... The tonic stays C, only the colour changes.
The most common source is the parallel minor (C minor). Do not confuse it with the relative minor (A minor), which has the same notes as C major and so brings nothing new. The other modes supply rarer borrowed chords.
What are the most common borrowed chords?
In C major, borrowed from C minor:
| Chord | Numeral | Changed note | Effect |
|---|---|---|---|
| Fm | iv | A♭ | Bittersweet, nostalgic |
| A♭ | ♭VI | A♭, E♭ | Wide, epic |
| B♭ | ♭VII | B♭ | Rock, open |
| E♭ | ♭III | E♭, B♭ | Dark and powerful |
| Dm7♭5 | iiø | A♭ | Soft, jazzy |
♭VII also belongs to C Mixolydian, which is why it is so common in rock. All these chords share one thing: they contain at least one flattened note from the minor scale (E♭, A♭ or B♭).
How to play borrowed chords on guitar
Three moves to try right now:
- C F Fm C (x32010, 133211, 133111, x32010). Only one finger moves: the A at the 2nd fret of the 3rd string drops to A♭ at the 1st fret, then to the open G. That chromatic line is the whole magic of the minor iv.
- C A♭ B♭ C with E-shape barre chords: A♭ at fret 4 (466544), B♭ at fret 6 (688766), C at fret 8 (8 10 10 9 8 8). The same shape climbs two frets twice: a heroic ending, typical of video game themes and stadium rock.
- D C G D in D major: C is the borrowed ♭VII, a classic 70s rock sound.
The minor iv also drives Radiohead's "Creep": G B C Cm.
How to use borrowed chords in your songs
- Swap IV for iv right before the tonic: C Am F Fm C. A guaranteed effect at the end of a chorus.
- End with ♭VI ♭VII I instead of V I for a bright cadence with no dominant.
- Play the backdoor ii-V: Fm7 B♭7 Cmaj7, a jazz favourite.
Modal interchange is one of the three pillars of reharmonization, alongside secondary dominants and tritone substitution. A single borrowed chord is often enough to transform a plain chord progression. The chord substitutions module suggests the borrowed chords available for each degree, with playable voicings.
Key takeaways
- Modal interchange = a chord taken from a mode with the same tonic (C minor inside C major).
- The most used: iv (Fm), ♭VI (A♭), ♭VII (B♭), ♭III (E♭).
- The flattened note creates the colour, often as a descending chromatic line.
- Parallel (same tonic), not relative (same notes).
Frequently asked questions
What is the difference between modal interchange and modulation?
With modal interchange the tonic does not change: you play Fm and come back to C, still in C. A modulation moves the tonal centre to a new tonic for several bars or more.
Why the parallel minor and not the relative minor?
The relative minor of C major is A minor: same notes, so same chords. The parallel minor is C minor: same tonic, but with E♭, A♭ and B♭. That is what brings new chords.
Does modal interchange work in a minor key?
Yes, the other way round: in A minor you borrow from A major, for example D major (IV) instead of Dm, or a final A major chord instead of Am, known as a Picardy third.
Related terms
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