| 24 Preludes & Fugues by D. Shostakovich boasts not only for its special creation of polyphony, also for its abundant employment of harmony. This paper analyzes this work in details, generalizes its techniques applied in the harmony, and highlights the characteristics of its harmony shifting and the expressive effects thus brought. The paper is composed of five chapters. The first chapter epitomizes the history background of the creation of the harmony shifting in the work. The second chapter deals with the techniques of the work—the composer shakes the root of the traditional functional harmony system and establishes the base of new thinking of tonality. The third chapter analyzes the expressive effects of the chord structural vertical shifting in the work. The fourth chapter focuses on the harmony sequence horizontal shifting. The last chapter centers on the musical expressive effects of the harmony shifting. This paper reveals how the composers employ the technique - harmony shifting in their work, moreover, why this technique is so important to the manifestation, extension, and conclusion of the musical incident, and to the creation of the classic, romantic, and modern music. This revelation is meaningful to the composition today.
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