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Cadences function as structural punctuation marks in composition—perfect authentic cadences mark full stops, half cadences create questions, plagal cadences offer gentle closures, and deceptive cadences provide surprises. Strategic cadence placement articulates form and guides listener expectations.
Compose 8-measure phrases with different cadential goals: some ending in perfect authentic cadences, others in half cadences mid-phrase. Analyze how cadence type and voice-leading quality affect perceptual closure.
Think of cadences as the punctuation marks of musical prose. You already know from your study of harmonic function that chords carry different weights — tonic chords feel stable, dominant chords create tension, and that tension wants to resolve. A cadence is simply the place where that tension-and-release cycle reaches a conclusion. But not all conclusions feel equally final, and the composer controls how definitive each stopping point sounds.
The perfect authentic cadence (PAC) — V to I with both chords in root position and the soprano landing on scale-degree 1 — is a full stop. It carries maximum closure because every element cooperates: strong root-position harmonies, the soprano's arrival on the tonic, and the decisive V-I harmonic motion. The imperfect authentic cadence (IAC) ends on I but lacks one of those conditions — perhaps the soprano lands on scale-degree 3, or the V chord is inverted — which produces a gentler, less final landing. The half cadence ends on V, leaving tension unresolved; it functions like a comma or a question mark, inviting what comes next. The deceptive cadence substitutes vi where the ear expected I after V, creating a swerve that feels like a promise unfulfilled. The plagal cadence (IV-I, the "Amen" cadence) arrives without dominant tension, making it feel spacious and gentle rather than decisive.
Strategic placement of these cadence types is how you articulate musical form. A standard 8-measure period consists of an antecedent phrase ending with a half cadence (the question) and a consequent phrase ending with a perfect authentic cadence (the answer). This question-answer structure is so intuitive that listeners orient to it immediately. When you extend or evade this pattern — reaching for a deceptive cadence where the PAC was expected, or stretching the phrase through a cadential extension — you create narrative tension because you are withholding the punctuation the listener anticipated.
Voice leading is inseparable from cadential strength. You know from voice-leading principles that the leading tone wants to rise to tonic and that the seventh of the dominant seventh chord wants to fall. At a PAC, both obligations are fulfilled simultaneously. A cadence where the leading tone is doubled in an inner voice and resolves upward while the soprano also moves to the tonic is noticeably stronger than one where the leading tone leaps away. The soprano's melodic approach to the final cadential note matters too: arriving by step feels smoother and more settled than arriving by leap. When you evaluate the strength of a cadence you're composing, ask: does the voice leading reinforce or undercut what the harmony is doing?
The practical skill is learning to make cadential hierarchy serve your formal intentions. Strong closures (PAC) belong at structurally important moments — the end of a period, the end of a section, the final resolution. Weaker closures (IAC, half cadence) belong at interior phrase endings that need to feel incomplete enough to invite continuation. Deceptive cadences work best when you have built up a clear expectation of a strong PAC; without that expectation, the "deception" registers as merely odd rather than dramatically effective. Plan your cadence types before you compose the inner phrases — they are the structural skeleton, and everything else hangs on them.
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