Page:Fugue by Ebenezer Prout.djvu/106

88 the 'Wohltemperirtes Clavier' is an instance. The exposition, which occupies the first four bars, is for three voices only, and the fourth voice does not enter till the 19th bar, when it brings in the subject by augmentation, and the last ten bars of the fugue are for four voices. A similar example will be seen in Bach's Organ Fugue in C major—

of which the first 48 bars are a four-part fugue, without pedals. At the 49th bar the pedals enter with the subject in augmentation (as in the case last mentioned), and from this point to the end the fugue is in five parts.

204. We now give an exposition of a four-part fugue, taking the same subject as before, but adding an entirely different countersubject and beginning with a middle voice. We choose the alto, so as to retain the same key.