Periodic sentence
A periodic sentence is a kind of grammatical theme defined and described in richards-2016. It can be split up into 2 phrases: the antecedent and the continuation.
In practice, you can think of it as a sentence but instead of a repetition of the basic idea (A), you have a different idea (B).
This form type is not commonly used in film music, though there are some prominent examples (below). (richards-2016 par.38)
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