However after strict rules about modern style poetry were consolidated in the Tang dynasty, gafu were mainly produced with only the title borrowed from kogafu in the period of Rikucho, and those gafu were almost the same as the old style poetry in their format.
しかし唐代に入って拘束の厳しい近体詩の規則が整備されると、楽府についてはただ六朝期の古楽府の題だけをとって作ることが盛行し、形式上ほぼ古体詩と変わらぬまでになった。