I was not familiar with the Choka so I have excluded an excerpt from Georgia of Bastet and Sekhmet's Library and our hosts inspiration image.
Choka were long, commemorative poems (in fact choka means the long poem) and the longest ran sometimes over 100 lines! They were usually sung. There were about 400 choka copied in the 8thcentury anthology of waka entitled Man'yoshu (Collection of Ten Thousand Leaves).
The classical choka is formed by writing 5-7 syllables couplets for as many lines as you like ending however with an extra 7 syllable line.
© G.s.k. ’14
wet snow and ice cling
branches bowed from extra weight
winter sun rises
beyond the blue mountaintop
wrapped in threadbare coat
peasant woman shuffles by
head bent against wind
hands tightly wrapped in old cloth
cheerful morning lark
chirps his gay song from treetop
yellow dog limps by
fur lightly coated in frost
I squat by my fire
stirring a can of red beans
drinking in sunlight
thoughts drifting away on smoke
oblivious to the cold