File originally posted fall 2005; last updated 20 February 2007.
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The examples below (go to examples) are meant as study and memory aids, to increase facility in using William Caplin's terms for formal functions in phrases and themes (sentence, period, and their hybrids): William E. Caplin, Classical Form: A Theory of Formal Functions for the Instrumental Music of Haydn, Mozart, and Beethoven (New York: Oxford University Press, 1998). I am grateful to Professor Caplin for his detailed comments on the lists and examples presented here (in an email message 10 September 2005).
1-2, 3-4: Two-bar units within the first four bars (of eight) normally function in one of three classes:
Note: under "repetition of the basic idea," Caplin distinguishes three types: exact, statement-response, and sequential. I would add "varied" as an alternative to "exact" for cases of minor embellishment.
5-6, 7-8:
Two-bar units within the second four bars (of eight) function in a variety of ways, including all those named above plus small model-sequence groups, fragmentation with or without sequence, cadential, and (rarely) new material.
1-4, 5-8:
Four-bar units function in one of six classes:
1-8:
Eight-bar units function in one of seven classes (I have added an eighth):
Caplin's seven classes make up the list of all the eight-bar functional units commonly found in the music of the Vienna School. Only three from all possible combinations of the four-bar units are missing: 1. presentation + consequent, which I have added because it is occasionally found in social dances: 2. presentation + cadential; and 3. compound basic idea + cadential. For nos. 2 & 3, I prefer to use the "continuation->cadential" option for a continuation phrase.