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Unity in Bach's Cantata No.78

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Unity in Bach's Cantata No.78

According to Rowell, "Musical composition became much longer, and composer were forced to evolve new means of maintaining unity and continuity over long time spans" during the Baroque period. Therefore, the texture of music became very important. When I look at the musical texutre of the Cantata No. 78 by J. S. Bach, I realized that this piece was unified very well within a movement and as a whole piece by many techniques. Some of those techniques were found in the text, and the others were in the music.

First of all, the text is well organized in terms of its unity. The piece has seven movements. According to Fuller, "The first and last movements adopt the text of an established …show more content…

As a length of piece gets longer, a composer needs to come up with more techniques to maintain unity. In case of the first movement, which is 144 measures long, Bach uses the technique of "variation over the common bass line." The common bass line is a descending cromatic phrase. At the beginning of the movement, this phrase is played by the continuo part. After it is repeated twice, the oboe takes over the phrase. Then, when the voices start singing, they begin with a short descending cromatic phrase. This descending cromatic phrase is played by different instruments at different time, and sometimes it disappears, but it always comes back in the music until the end of the movement. By composing variations over this descending cromatic phrase, Bach keeps the unity of the longest movement among the whole Cantata No. 78.

At last, the first movement and the last movement have a very strong relationship to keep unity as a whole piece. One of the two factors is that the melody from the last movement is sung in the several parts of the first movement. In the first movement, soprano always sings at the end of the phrase without any repeated word from the text. The melody of the soprano line is always the same melody as the last movement, and the soprano sing the melody in the same order as it sung in the last movement. For example,both movements are constructed by eight verses, and the melody of the first

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