乐府诗换韵与乐曲的关系

Association of Rhyming Variation in Yuefu Poetry to Music

汉魏六朝的乐府诗多以四句为"一解",与一支乐曲相配。唐代的一部分乐府诗仍用旧题,但篇幅往往加长,显然不能与一支乐曲相配。据《乐府诗集》所载,仔细考察此类长篇乐府诗,大多四句换一韵,故可推测换韵与乐曲相关。也就是说,以一支乐曲的反复演奏而将歌词唱完,这一情形与"联章"体制相似。

In times of the Han, the Wei and the Southern and Northern Dynasties, most Yuefu poems took four lines as ＂one stanza＂ matching with a given melody. Up till the Tang Dynasty, part of Yuefu poems succeeded the old subjects but their texts were much lengthened, which made it obviously impossible to match with the original melodies. A careful investigation of this kind of lengthy Yuefu poem based on The Collection of Yuefu Poems, the rhyme of most such lengthy poems varied every four lines, which can be inferred to be associated with melodies. In other words, it was by playing the same melody repeatedly that a lengthy Yuefu poem would be completed, which was much similar to the old uni-topic system.