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 with the subject", occurring against the answer (Benward & Saker 2009, 2:50). It is not usually regarded as an essential feature of fugue, however (Walker 2001).
The typical fugue opening resembles the following (Benward & Saker 2009, 2:50):
Soprano voice: Answer Alto voice: Subject Countersubject
Since a countersubject may be used both above and below the answer, countersubjects are usually invertible, all perfect fifths inverting to perfect fourths which required resolution (Benward & Saker 2009, 2:51).
- Benward, Bruce, and Marilyn Nadine Saker. 2009. Music in Theory and Practice, eighth edition. 2 vols. + 2 CD sound discs. Boston: McGraw-Hill. ISBN 978-0-07-310188-0.
- Walker, Paul M. 2001. "Countersubject". The New Grove Dictionary of Music and Musicians, second edition, edited by Stanley Sadie and John Tyrrell. London: Macmillan Publishers.
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