The Fuga is one of the most complex and interesting compositions of Bach and is characterized by the imitation.
Its structure, in general, is even if others have some variants of the following scheme: exposure, counter exposure, development and entertainment, close, pedal
The elements that characterize it are four: SUBJECT, ANSWER to dominant tonality, CONTROVERSY, FREE PART.
«The preludes and fugues of the well-tempered harpsichord are the Old Testament, Beethoven’s sonatas the New Testament of a pianist». Hans von Bùlow
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