Burmese court poets formalize the yadu (လွင်) genre, which originated in rural rain-ritual songs and harvest folklore. These poems use a 15-syllable line with internal rhyme and describe seasonal changes, folk festivals (water festivals, robe-offering), and natural omens from pre-Buddhist nats (spirits). Nat Pwe spirit possession chants influence the meter.

The yadu genre's folk prosody—a unique 'climbing tone' pattern derived from rice-pounding rhythms—influenced all subsequent Burmese classical poetry, including Prince Natshinnaung's 17th-century works. Modern poet Min Thu Wun revived yadu forms to assert Burmese identity against British colonialism. Yadu demonstrates how agricultural folklore generates sophisticated quantitative meters that outlast the rituals that created them, influencing national poetics for centuries.