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
Epic poetry rhyme royal, though in the 16th century the Spenserian stanza and blank verse were also introduced. The French alexandrine is currently the heroic line in French literature, though in earlier periods the decasyllable took precedence. In Polish literature, couplets of Polish alexandrines (syllabic lines of 7+6 syllables) prevail. In Russian, iambic tetrameter verse is the most popular. In Serbian poetry, the decasyllable is the only form employed. Epic poetry An epic poem, epic, epos, or epopee is a lengthy narrative poem, ordinarily involving a time beyond living memory in which occurred the extraordinary doings of the extraordinary men and women