The major-minor functional harmony had become a normal system of technique in the classical period, of which strict T-S-D-T logic becomes the common rules of composers' practice. The classical con- sonance became perfect, which advances the balances between emotional expression ,reason and formal aes- thetics. The harmonic style and aesthetic interest of Pre-classical period are exposed to Rococo, gallant style and empfindsamkeit. Viennese Classical School is the summit of the classical music,of which the per- fect classical consonance and the varied relationship between the consonance and dissonance clearly reflect the harmonic style and aesthetic meaning in elegance, balance and rigor.%古典主义时期,大小调功能和声已成为一种定型的技法体系,其严谨的T-S-D-T功能逻辑成为创作实践中作曲家们共同遵循的准则。古典主义协和观念日臻完善,并促进人们感情表达与理性观念、形式美的统一。罗可可风格、华丽风格、情感风格凸显出前古典时期和声风格与人们的审美情趣。维也纳古典乐派是古典主义音乐的顶峰,其完美的古典主义协和观念、协和与不协和的丰富的平衡关系,鲜明地体现出典雅、均衡、严谨的和声风格与审美意蕴。
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