Metre (poetry) of over some two-and-a-half millennia. Beginning with the earlier recorded forms: the Classic of Poetry tends toward couplets of four-character lines, grouped in rhymed quatrains; and, the Chuci follows this to some extent, but moves toward variations in line length. Han Dynasty poetry tended towards the variable line-length forms of the folk ballads and the Music Bureau yuefu. Jian'an poetry, Six Dynasties poetry, and Tang Dynasty poetry tend towards a poetic metre based on fixed-length lines of five, seven, (or, more rarely six) characters/verbal units tended to predominate, generally in couplet/quatrain-based forms, of various total verse lengths. The Song poetry
Anisometric verse Anisometric verse Anisometric verse, known also as heterometric stanza, is a type of poetry where the stanza is made up of lines having unequal metrical length. The number of syllables within the individual lines do not correspond, nor do the number of feet. In poetry, a foot is a group of syllables where one of the syllables is accented or stressed more than the others. Traditionally, poetry uses isometric stanza, each line having the same number of syllables and the same number of feet. Before the 20th century, anisometric verse was rarely seen. Two exceptions are William Wordsworth's "Ode: Intimations