《文心雕龙·乐府》
后来曹植、陆机等人，都写过较好的诗，但并没有令乐师制谱，所以不能演奏。
子建士衡，咸有佳篇，并无诏伶人，故事谢丝管，俗称乖调，盖未思也。
Later, Cao Zhi, Lu Ji, and others all wrote relatively good poetry, but they did not ask musicians to write scores for them, so it could not be performed.