J. S. Bach. Wohltemperirtes Clavier, Fugue 37.
the countersubject (C S.) is mostly in longer notes than the subject, though at the beginning of (a) contrast is secured by accompanying the quavers of the subject by semiquavers. Let the student play the countersubjects by themselves, and notice how different they are from the subjects, and at the same time how thoroughly suited to them in character.
163. Our next illustration shows the opposite case—
J. S. Bach. Wohltemperirtes Clavier, Fugue 44.
Here the countersubject does not enter with the first note of the answer; but between it and the subject are a few notes of codetta (§ 62). This often happens; sometimes, as will be seen presently, only a part of the subject or answer is accompanied by the countersubject. In the above passage we see a subject in long notes accompanied by a countersubject of very short notes.
164. On its first appearance, in company with the answer, the countersubject should be in the same key as the answer. In the example last given the answer is in E minor, and the counter-subject is no less distinctly in the same key. Sometimes, however, as in our example to § 67, the key of the answer is not clearly defined by the countersubject until nearly the close.