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Harmony Analysis of Chopin's Prelude in A Minor
This is harmony analysis, and that is music analysis. How can it be the same? Hmm ... The whole song is filled with a kind of gloomy and deep emotion, and the composer designed a "sigh" motivation for it, going down four times and going up three times, and the left hand is accompanied by a "staggered" chord disyllabic decomposition. The rhythm duration changes every time this repetitive segment appears: the second rhythm duration is tightened and the third rhythm duration is expanded; At the same time, the position where riff enters the bar changes every time: the first time it enters in the strong beat, the second time it moves to the strong position, and the third time it appears in the weak position. The change of rhythm duration and voice position makes the theme motivation familiar with an accident every time, which avoids the dullness of music on the one hand and deepens the bleak and gloomy atmosphere on the other.

Tonality layout and harmony application are a major feature of this song. Although the main theme of the work is A minor, it starts from the subordinate key E minor, and changes many times in just over twenty bars: first, it turns to the relative major G major in the fourth bar, then the material of the first sentence turns to B minor when the second sentence in the eighth bar enters, and then turns to D major in the 10 bar according to the previous mode of modulation. Then, the harmony was unexpectedly carried out in the section 1 1: instead of carrying out the main chord in D major according to the previous mode, the root tone of the D major chord was raised to the auxiliary leading seventh chord VII7/II, and at the same time, the redirected seventh chord VII7/V in A minor became the middle chord, so that the tonality returned to the main theme after A minor smoothly.

Tonality is mostly in a free state, so the timbre of this work is very weak most of the time, and the melody hums intermittently, which makes it difficult for us to distinguish this work from the style characteristics of the sound. In fact, this kind of tonal fuzzy layout technique and line drawing of voice have some characteristics of impressionist harmony.