Chords and harmonic progressions in VCE Music

What this dot point is asking

Harmony is central to the music language strand. You need to build chords from a given root, identify their quality and inversion, and trace how chords move through a progression to a cadence. This underpins transcription, analysis of works and your own composition.

Building triads

A triad is three notes stacked in thirds. The lowest is the root, then the third and the fifth. The quality depends on the size of those thirds.

In a major key the diatonic triads are: I major, ii minor, iii minor, IV major, V major, vi minor and vii diminished. Capital Roman numerals show major chords, lower case show minor, and a small circle marks the diminished chord. Knowing this pattern lets you label any chord in a key instantly. The minor key is less uniform: the natural minor gives i, ii diminished, III, iv, v, VI and VII, but composers almost always raise the seventh degree (the harmonic minor) so that the chord on the fifth becomes a major V and the cadence onto i sounds decisively closed. That raised leading note is why so much minor-key music has a dominant chord that is major even though the key is minor, and recognising it is a frequent VCAA written-test point.

Chords also carry a sense of function, not just a label. The tonic (I) is the point of rest; the dominant (V and vii) creates the strongest pull back to it; the subdominant (IV and ii) prepares the dominant and gives a feeling of moving away from home. Hearing a progression as tonic, then pre-dominant, then dominant, then tonic explains why I, IV, V, I feels so grounded: each chord has a job in the journey away from and back to the tonic.

Seventh chords

Adding a fourth note a third above the fifth creates a seventh chord. The most important is the dominant seventh (V7), a major triad with a minor seventh, which carries a strong pull to the tonic. Other common types are the major seventh (bright, jazzy), the minor seventh (smooth) and the half-diminished seventh built on the leading note.

Inversions

A chord is in root position when its root is the lowest sounding note. If the third is in the bass it is first inversion, and if the fifth is in the bass it is second inversion. Inversions change the bass line and the colour without changing the chord's identity. Figured bass or slash chords (for example C/E) tell you which note is in the bass.

Cadences

A cadence is a two-chord progression that punctuates a phrase, like musical punctuation.

• Perfect (authentic) cadence: V to I, a full stop, sounds finished.
• Imperfect (half) cadence: any chord to V, a comma, sounds unfinished.
• Plagal cadence: IV to I, the amen cadence, gentle close.
• Interrupted (deceptive) cadence: V to vi, a surprise that avoids the expected tonic.

Common progressions

Certain progressions appear constantly across styles. The I, IV, V and I, V, vi, IV progressions drive most pop and rock. The ii, V, I is the backbone of jazz, and it often arrives with seventh chords (iim7, V7, Imaj7) that smooth the voice leading. The 12-bar blues uses I, IV and V in a fixed 12-bar pattern, conventionally with dominant-seventh quality on all three chords, which is what gives the blues its characteristic edge. Recognising these by ear lets you predict and notate harmony quickly.

Voice leading is the thread that joins one chord to the next smoothly. Common notes are held over where possible and the remaining voices move by the smallest step available, which is why a V to I cadence sounds inevitable: the leading note rises a semitone to the tonic and the dominant's seventh, if present, falls a step into the third of the tonic chord. Describing voice leading, not just naming chords, is what lifts a harmonic analysis into the top band, because it explains why a progression sounds the way it does.

Hearing harmony

Train your ear to hear the bass line first, because the bass often carries the root and reveals the progression. Then listen for whether each chord sounds bright (major) or dark (minor), and whether a seventh adds tension. For cadences, focus on the final two chords and whether the phrase sounds finished or suspended.

Drill chord construction in several keys, label progressions with Roman numerals, and identify cadences in recorded extracts. Secure harmony makes both your aural exam and your written analysis far more reliable.