What is a Fugue?

A fugue is a highly structured form of polyphonic composition in which a short musical theme, called the subject, is introduced by one voice and then successively imitated by other voices in a systematic way. The voices enter at different times and often at different pitch levels, creating a dense, interwoven texture.

In a fugue, the subject is typically followed by a counter-subject or additional melodic material that accompanies the imitating entries. The composition alternates between exposition, where all voices present the subject, and episodes, which develop the thematic material through sequences, modulation, and contrapuntal techniques.

Fugues are widely used in Baroque music, especially by composers like Johann Sebastian Bach, who mastered the form in works such as The Well-Tempered Clavier. The fugue is studied extensively in composition and theory because it demonstrates mastery of imitation, counterpoint, voice leading, and harmonic structure, making it one of the most important forms in Western music.