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
Political verse as ivy-leaves around the ruin'd turret wreathe, All green and wildly fresh without, but worn and gray beneath. </poem> But in the English poetry the lines have mostly masculine rhyme whereas in Greek poetry the fifteen syllable feminine line is the norm of the Political verse. The Political verse characterizes traditional Greek poetry, especially between 1100 and 1850. It is the verse in which most Greek folk songs are written, including such temporally distant works as the medieval Cretan romance "Erotokritos" and the 3rd draft of Dionysios Solomos' ""The Free Besieged"", considered the masterpiece of modern Greek poetry. It is