10.1 · Modal Interchange

Two keys, one home

Borrowing from C minor is one case of a bigger idea: modal interchange. Every parallel mode of C (C minor, C mixolydian, C dorian, and the rest) shares the same tonic, so every one of their chords is on loan whenever you want it. Home stays the same. Only the chords on loan change.

The saddest chord in pop: iv

Lower IV's middle note a half step and it turns minor: the borrowed iv, pop's favorite heartbreak move. It's in a thousand ballads, and in Radiohead's Creep.

C
F
C

All diatonic. IV strolls home, nothing borrowed.

C
F
Fm
C

Same trip, but IV turns to iv on the way home. One note moves, A down to A♭, and the phrase turns bittersweet.

The borrowed v

Even V has a borrowed replacement. Minor v keeps the motion but loses the pull home: reflective instead of insistent. Mixolydian lends it (alongside bVII).

Where the loans come from

C minor lends iv, bIII, bVI, bVII; C mixolydian lends v and bVII. Each button plants the loan between two I chords, so you hear the visit and the return.

From C minor
From C mixolydian

Quiz

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Modal interchange means…

Score 100% on every quiz and game to complete this lesson. A perfect run sticks: a later miss never undoes it.The borrowed palette →