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Harmonic function — Music, 14–17 years

How chords create rest, movement and expectation in relation to a tonal centre. Music, 14–17 years.

What a chord is doing

Harmonic function describes a chord’s job in a key, not just its name. Some chords feel settled, some move away from home, and some create pressure to return. In a major key these roles are often called tonic, predominant and dominant.

Why give chords different jobs?

A list of chords does not explain why a progression feels like a journey or an ending. Function gives listeners a sense of direction: music can leave a tonal centre, increase expectation and then resolve. This solves the problem of making harmony feel organised rather than random.

I–IV–V–I in C major

In C major, chord I is C–E–G, so it feels like home. Chord IV is F–A–C; it moves away and prepares the journey. Chord V is G–B–D; the B strongly points towards C. Playing I–IV–V–I therefore gives rest, departure, tension and return.

Function is not fixed forever

It is tempting to think that a chord has one permanent function, because its name and notes stay the same. In fact, its role depends on the key and on the chords around it. A C major chord feels like home in C major, but it can have a different job when another tonal centre is established.

Making a song feel unfinished

Songwriters use harmonic function to control whether a section feels settled or needs another phrase. Ending on the dominant can leave a listener expecting the tonic, while ending on the tonic feels more final. Film composers use the same tension to make a scene feel uncertain, urgent or complete.

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