瑜伽論記 6.369

6.369

泰云：應頌有三：一、於說義中間應以偈頌上義；二、於說義最後重頌前義；三、於諸經中頌及長行未了義經應更分別故名應頌。

Tai says: Melodic chants are of three kinds: first, in the middle of explaining the meaning, one ought to summarize the above meaning in verse; second, at the very end of explaining the meaning, repeating the prior meaning in verse; third, among the various sūtras, where verses and prose leave the meaning incomplete, they should be further analyzed; hence they are called 'melodic chants'.