What makes borrowed chords emotionally effective when used in a major-key context?
Think about your answer, then reveal below.
Model answer: Borrowed chords introduce flatted scale degrees (especially the b6 and b7) that create a momentary darker, more minor-tinged color without leaving the major key. The contrast between the major-key brightness and the borrowed chord's darkness creates expressive tension.
The power of borrowed chords lies in the contrast they create. In a bright major context, a suddenly minor iv or a bVI chord introduces notes foreign to the scale, creating a shadow or emotional weight. Because the tonal center does not change, the listener experiences the color shift but does not feel lost — the harmony returns to familiar territory.