imayō-uta; Heian/Kamakura verse form
A historical Japanese verse form consisting of four lines, each divided into two parts of 7 and 5 syllables. Used in the Heian and Kamakura periods; now a literary and historical term.
Imayō-uta is a type of song that was popular from the Heian period through the Kamakura period.
Many imayō-uta are collected in the 'Ryōjin Hishō'.