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
A Prayer for My Daughter quatrain of enclosed rhyme. Many of the rhyme pairs use slant rhyme. The stanza may be seen as a variation on ottava rima, an eight-lined stanza used in other Yeats poems, such as "Among School Children" and "Sailing to Byzantium." Metrical analysis of the poem, according to Robert Einarsson, proves difficult because he believes Yeats adheres to "rhythmical motifs" rather than traditional use of syllables in his meter. In stanza two, Einarsson points out instances where the meter of the poem contains examples of amphibrachic, pyrrhicretic, and spondaic feet. He argues that the complexity of Yeats's verse follows patterns of