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In page Hua Mulan:

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The Ballad of Mulan was first transcribed in the Musical Records of Old and New,[note 1] a compilation of books and songs by the monk Zhijiang in the Southern Chen dynasty in the 6th century. The earliest extant text of the poem comes from an 11th- or 12th-century anthology known as the Music Bureau Collection,[note 2] whose author, Guo Maoqian, explicitly mentions the Musical Records of Old and New as his source for the poem. As a ballad, the lines do not necessarily have equal numbers of syllables. The poem consists of 31 couplets and is mostly composed of five-character phrases, with a few extending to seven or nine.[citation needed]