Music theory / borrowed chords
Borrowed chords: adding modal color without leaving the key
A borrowed chord is a chord taken from the parallel minor (or parallel major) and used in the current key. In C major, borrowing the iv from C minor gives you F minor. Same tonic, different tonal color. Called modal mixture in textbooks.
Parallel keys share a tonic but not a key signature. C major (no accidentals) and C minor (three flats) are parallels. A borrowed chord takes a chord from the parallel key and drops it into the current progression. The tonic stays the same; the color shifts.
The four common borrows in a major key
- iv (minor iv): in C major, F minor instead of F major. Famous plagal cadence variant, iv-I, called the "Amen with a shadow."
- ♭VII (flat seven major): in C major, B♭ major. The rock cadence. See Sweet Home Alabama or any Beatles song from 1965 onward.
- ♭VI (flat six major): in C major, A♭ major. Dark and cinematic. Common in film scores.
- ♭III (flat three major): in C major, E♭ major. Almost always paired with ♭VII (E♭-B♭ -> C).
Hear it: I to iv to I
Play C major, then F minor, then C major again. The F minor chord will sound briefly cold, then release back into the tonic. That is the whole mixture technique. Beatles, Blackbird: the chorus lands on a minor iv.
Hear it: I to ♭VII to IV
Play C major, then B♭ major, then F major. This is the AC/DC turnaround, the Aerosmith turnaround, the rock cliche. Both borrowed chords come from C Mixolydian (which shares six notes with C major, differing only on the seventh degree).
Aldwell and Schachter analyze modal mixture as a way of expanding the harmonic vocabulary without modulating. The tonic remains, but the mode is briefly re-colored. They distinguish mixture from modulation: mixture keeps the tonic; modulation moves the tonic. The distinction is crucial for correct analysis.
Aldwell & Schachter, Harmony and Voice Leading, 5th ed, ch. 21.
Practice with the generator
Open the chord progression generator, set to rock or pop preset, and look for progressions with ♭VII or minor iv. Once you can spot them by ear, you have modal mixture nailed.
Borrowed chords in a minor key
The same technique reverses. In A minor, borrow from A major: the major III chord (C# major) or the major VI (F# major). Less common in pop, but common in Bach and in classical minor-mode movements that need a moment of light.
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