Phrase, Period, and Cadence
The small-scale grammar of musical structure — how phrases group and close.
Definition
The study of the smallest complete units of musical structure — phrases and their groupings into periods and sentences — and the cadences that articulate their endings.
Scope
Covers the basic units of musical syntax: the phrase as a complete musical thought, its combination into antecedent-consequent periods and sentence structures, and the cadences (authentic, half, deceptive, plagal) that punctuate them. Provides the building blocks for the larger conventional forms treated elsewhere in this area.
Core questions
- What defines a musical phrase?
- How do antecedent and consequent phrases form a period?
- What is the sentence structure of presentation and continuation?
- What are the main cadence types and how do they differ in finality?
- How does phrase structure scale up into complete forms?
Key theories
- Sentence and period as formal types
- Drawing on Schoenberg and systematized by Caplin, classical phrase structure is analyzed into two main types — the period, built from balanced antecedent and consequent phrases, and the sentence, built from a repeated presentation followed by a continuation driving to a cadence.
History
The analysis of phrase and period was developed by nineteenth- and twentieth-century theorists from the practice of the classical masters; Schoenberg's distinction between sentence and period was later refined into Caplin's theory of formal functions.
Key figures
- Arnold Schoenberg
- William E. Caplin
Related topics
Seminal works
- caplin1998
- schoenberg1967
Frequently asked questions
- What is the difference between a sentence and a period?
- A period balances an antecedent phrase ending on a weak cadence against a consequent phrase ending on a stronger one; a sentence presents a short idea, repeats it, then continues with fragmentation toward a cadence.
- What is a cadence?
- A harmonic and melodic formula that closes a phrase, ranging from the strong finality of a perfect authentic cadence to the open, question-like effect of a half cadence.