When the first voice has completed the subject, and the second voice is playing the answer, the first voice usually continues by playing a new theme that is called the countersubject. The countersubject usually contrasts with the subject/answer phrase shape. In a fugue, a countersubject is `the continuation of counterpoint in the voice that began....
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http://en.wikipedia.org/wiki/Countersubject
(from the article `fugue`) The answer is typically accompanied by counterpoint in another voice; if the same pairing continues throughout the fugue, that contrapuntal voice is ...
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http://www.britannica.com/eb/a-z/c/150
a theme in a fugue that occurs simultaneously with the second and often the subsequent themes of the main subject.
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https://www.infoplease.com/dictionary/countersubject
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