What Is a Borrowed Chord?

A borrowed chord is a chord imported from the parallel key — most often, a chord from the parallel minor used in a major-key song. Writing in C major but grabbing Fm, A♭, or B♭ (all native to C minor)? Those are borrowed chords, also called modal interchange. They're the single most common source of that one chord in a pop song that sounds gorgeously "wrong."

The usual suspects

Borrowed from the parallel minor into a major key:

• iv (minor four) — Fm in C major. The famous "sad plot twist," usually right before returning home: Radiohead's "Creep" runs I–III–IV–iv.
• ♭VI — A♭ in C major. Epic, anthemic lift.
• ♭VII — B♭ in C major. The rock 'n' roll backdoor chord: I–♭VII–IV drives "Sweet Home Alabama"-style choruses.
• ♭III — E♭ in C major. Gritty, bluesy sidestep.

Why they work

A borrowed chord breaks the diatonic frame just enough to surprise, while the shared tonic keeps the song anchored — the ear hears "same home, different weather." The full field guide, including how to find these on the fretboard, is Chords Outside the Key.

Related terms

• Parallel keys — where the borrowing happens
• Secondary dominant — the other main out-of-key trick
• Diatonic — the rule being elegantly broken